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      12-10-2018, 09:01 AM   #45
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Quote:
Originally Posted by ZM2 View Post
Quote:
Originally Posted by mike@x-ph.com View Post
It does but 300 CEL is too restrictive, you might as well keep your stock downpipe in this case.

We carry the Fabspeed downpipe with 200 CEL HJS Cats.
I’m on the fence on this one.

I really don’t want more exhaust volume for road trips, and no additional smell. I also want the downpipe to last for years and all my trips to the track running at WOT. It seems like the 300 cell would be better in my case, while still giving some additional power.

I was also probably going to run SeanWRT BM3 Dinan FBO map, and he’s using the 300 cell HJS.
If you ask him he will tell you the sport cat is not even remotely worth the money in terms of value if just going fbo.
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      12-10-2018, 09:07 AM   #46
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Originally Posted by PackPride85 View Post
If you ask him he will tell you the sport cat is not even remotely worth the money in terms of value if just going fbo.
I don’t want to detract from the point of this thread, but I’m not clear on your comment.

Are you saying any high flow downpipe? Or, 200 vs 300? Or, in SeanWRT and my application of running the Dinan turbo with Sean’s BM3 map?
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      12-10-2018, 10:33 AM   #47
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Originally Posted by ecitizen View Post
IMHO for the majority of us daily drivers (not the track dudes/dudettes or 20 somethings;-) the fabspeed sport cat with stock exhaust is perfect. Cold starts are very loud for a brief moment and then settles to a great clean but tough sound. Driving it sounds great but not like you are trying to be a wannabe racer or someone who is trying to draw a ton of attention. It's enough to turn heads with admiration of those who appreciate it but doesn't cause other to think "what a d bag". I just had the sport cat installed and was debating whether to do an aftermarket exhaust but there is no way I'm adding more sound now that I have it. Anything more would have too much drone and be way to loud for a neighborhood daily driver car.

Again, just my opinion but I think for the majority of regular drivers, the fabspeed sport cat with stock exhaust is as far as I would go on sound plus you get the nice power boost and no cel.
Agree!

Quote:
Originally Posted by mike@x-ph.com View Post
200 CEL will not add any volume to the exhaust if you are not going wide open throttle and will last just as long as the 300 CEL.

As for power, i have not seen any dyno showing 300 CEL adding power over stock with everything else identical
Quote:
Originally Posted by mike@x-ph.com View Post
It does but 300 CEL is too restrictive, you might as well keep your stock downpipe in this case.

We carry the Fabspeed downpipe with 200 CEL HJS Cats.
I agree that the Fabspeed 200 CEL cat will not add much sound aside from start up and when you rev it up. My car is still pretty quiet and calm in comfort mode with no drone. I have only the dp and no other engine/exhaust mods.

I read in another thread that the 300 CEL cat flows about 80% while the 200 flows about 90% of the air. If that is true, I have two questions...

1. What CEL is the stock cat? I'm guessing 400-800 but I cant find a number. If its 400, the jump from 400 to 300 is probably not worth it. But if its 800 stock, the difference between a 200 vs 300 wont seem as much.

2. What percentage air flow is going through the stock cat? If the 300 is 80%, and the 200 is 90%... ???
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      12-10-2018, 11:32 AM   #48
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Quote:
Originally Posted by Blurbo311 View Post
Quote:
Originally Posted by ecitizen View Post
IMHO for the majority of us daily drivers (not the track dudes/dudettes or 20 somethings;-) the fabspeed sport cat with stock exhaust is perfect. Cold starts are very loud for a brief moment and then settles to a great clean but tough sound. Driving it sounds great but not like you are trying to be a wannabe racer or someone who is trying to draw a ton of attention. It's enough to turn heads with admiration of those who appreciate it but doesn't cause other to think "what a d bag". I just had the sport cat installed and was debating whether to do an aftermarket exhaust but there is no way I'm adding more sound now that I have it. Anything more would have too much drone and be way to loud for a neighborhood daily driver car.

Again, just my opinion but I think for the majority of regular drivers, the fabspeed sport cat with stock exhaust is as far as I would go on sound plus you get the nice power boost and no cel.
Agree!

Quote:
Originally Posted by mike@x-ph.com View Post
200 CEL will not add any volume to the exhaust if you are not going wide open throttle and will last just as long as the 300 CEL.

As for power, i have not seen any dyno showing 300 CEL adding power over stock with everything else identical
Quote:
Originally Posted by mike@x-ph.com View Post
It does but 300 CEL is too restrictive, you might as well keep your stock downpipe in this case.

We carry the Fabspeed downpipe with 200 CEL HJS Cats.
I agree that the Fabspeed 200 CEL cat will not add much sound aside from start up and when you rev it up. My car is still pretty quiet and calm in comfort mode with no drone. I have only the dp and no other engine/exhaust mods.

I read in another thread that the 300 CEL cat flows about 80% while the 200 flows about 90% of the air. If that is true, I have two questions...

1. What CEL is the stock cat? I'm guessing 400-800 but I cant find a number. If its 400, the jump from 400 to 300 is probably not worth it. But if its 800 stock, the difference between a 200 vs 300 wont seem as much.

2. What percentage air flow is going through the stock cat? If the 300 is 80%, and the 200 is 90%... ???
If akrapovic declare with hjs 300 ece cell +9,5kw probably oem is 600/800. Otherwise how can you reach this power with 100 cel less??
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      12-10-2018, 11:55 AM   #49
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I forget where I saw it, but an oem retailer listed the stock downpipe as 700
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      12-10-2018, 01:25 PM   #50
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Quote:
Originally Posted by mike@x-ph.com View Post
200 CEL will not add any volume to the exhaust if you are not going wide open throttle and will last just as long as the 300 CEL.
That seems contrary to what I've read unless I'm misinterpreting your comment. Most notice an increase in exhaust volume (dB) when going from stock to Fabspeed (200 cell) cat.

(EDIT) Maybe you're referring to going from 300 to 200?
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      12-10-2018, 01:28 PM   #51
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Quote:
Originally Posted by cecaa850 View Post
Quote:
Originally Posted by mike@x-ph.com View Post
200 CEL will not add any volume to the exhaust if you are not going wide open throttle and will last just as long as the 300 CEL.
That seems contrary to what I've read unless I'm misinterpreting your comment. Most notice an increase in exhaust volume (dB) when going from stock to Fabspeed (200 cell) cat.

(EDIT) Maybe you're referring to going from 300 to 200?
There is a definite increase in volume and power even with stock exhaust. It's a nice upgrade.
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      12-10-2018, 01:30 PM   #52
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Quote:
Originally Posted by cecaa850 View Post
That seems contrary to what I've read unless I'm misinterpreting your comment. Most notice an increase in exhaust volume (dB) when going from stock to Fabspeed (200 cell) cat.

(EDIT) Maybe you're referring to going from 300 to 200?
I think Mike was referring to my comment of not wanting any additional exhaust noise on road trips. So, he said no additional noise when just cruising, but more when you punch it.

Another commenter said the same about when driving in Comfort mode.

Altho, would love to hear others’ input on exhaust volume change when you’re just cruising in Comfort.
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      12-10-2018, 03:44 PM   #53
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Quote:
Originally Posted by ZM2 View Post
I think Mike was referring to my comment of not wanting any additional exhaust noise on road trips. So, he said no additional noise when just cruising, but more when you punch it.

Another commenter said the same about when driving in Comfort mode.

Altho, would love to hear others’ input on exhaust volume change when you’re just cruising in Comfort.
Correct.

When cruising the difference is barely noticeable
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      12-10-2018, 06:43 PM   #54
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Stock is 600 cell. 200/300 cell adds about 10+ peak hp and 15+ low down torque, flashed or not. Going from high flow to catless adds absolutely zero power at the stock/STG1 turbo power level. We tested everything with our abuse car in 2017.

After the O2 sensor that sits in the middle of downpipe, there is a second cat chamber (4' in dia) with the 300 cell, compared to the straight 3' pipe with 200 cell. 4' pipe has 77% more cross section area than 3', which is why 300 cell isn't really more restrictive.

The sound difference between 200 and 300 cell is not all that much, though catless is massively louder. If 200 is too loud for you, so would be the 300. But pretty much every one I know can live with high flow mated to stock cat back.

200 cell adds power and sound with minimal loss of stock drivability. 300 cell trade a bit loudness for 100% stock and is the best value IMO.
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      12-10-2018, 07:33 PM   #55
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Quote:
Originally Posted by SeanWRT View Post
Stock is 600 cell. 200/300 cell adds about 10+ peak hp and 15+ low down torque, flashed or not. Going from high flow to catless adds absolutely zero power at the stock/STG1 turbo power level. We tested everything with our abuse car in 2017.

After the O2 sensor that sits in the middle of downpipe, there is a second cat chamber (4' in dia) with the 300 cell, compared to the straight 3' pipe with 200 cell. 4' pipe has 77% more cross section area than 3', which is why 300 cell isn't really more restrictive.

The sound difference between 200 and 300 cell is not all that much, though catless is massively louder. If 200 is too loud for you, so would be the 300. But pretty much every one I know can live with high flow mated to stock cat back.

200 cell adds power and sound with minimal loss of stock drivability. 300 cell trade a bit loudness for 100% stock and is the best value IMO.
Can you please share dyno of these tests?
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      12-10-2018, 07:54 PM   #56
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Quote:
Originally Posted by mike@x-ph.com View Post
Can you please share dyno of these tests?
Mike I don't think anyone outside of vendor would dyno just before and after DP. See below the thread link of a M235i owner sharing his dyno experience where he sees a 11hp gain (318whp vs 307whp) from HJS 300 cell alone on stock flash (10~12psi).
https://www.babybmw.net/forum/viewtopic.php?t=84130

My tests were purely based on 100-200kph times with our abuse car. In early 2017 that car was on FMIC/decat and JB4. The best we did on E30 is low 9s on flat 17~18psi map. Couldn't live with the smell, we switched to 200 cell but nothing changed. We even got slightly better results - occasionally broke into 8.8/8.9s. Couldn't do more ethanol because of fuel pump limit.

In mid 2017, we loaded BM3 as BEF and installed WMI, trying to max out stock turbo at ~20psi (taper to 18). We did consistently mid to low 8s at around 80 IAT. Still beaten by a 140i on meth (low to flat 8s), we thought decat can help, so put it back on. But actually it was just loud and smells and don't improve power and 100-200 time at all. Till this day, that abuse car is still FBO on meth and stock turbo. We love that car. It's tuned up to 11, super urgent and ready to fight. Most importantly, it educates me well what M2 stock can do. BTW, on that setup it can barely survive one hard lap at Shanghai International Circuit (F1).
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Last edited by SeanWRT; 12-10-2018 at 08:19 PM..
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      12-11-2018, 08:30 AM   #57
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Quote:
Originally Posted by SeanWRT View Post
Mike I don't think anyone outside of vendor would dyno just before and after DP. See below the thread link of a M235i owner sharing his dyno experience where he sees a 11hp gain (318whp vs 307whp) from HJS 300 cell alone on stock flash (10~12psi).
https://www.babybmw.net/forum/viewtopic.php?t=84130

My tests were purely based on 100-200kph times with our abuse car. In early 2017 that car was on FMIC/decat and JB4. The best we did on E30 is low 9s on flat 17~18psi map. Couldn't live with the smell, we switched to 200 cell but nothing changed. We even got slightly better results - occasionally broke into 8.8/8.9s. Couldn't do more ethanol because of fuel pump limit.

In mid 2017, we loaded BM3 as BEF and installed WMI, trying to max out stock turbo at ~20psi (taper to 18). We did consistently mid to low 8s at around 80 IAT. Still beaten by a 140i on meth (low to flat 8s), we thought decat can help, so put it back on. But actually it was just loud and smells and don't improve power and 100-200 time at all. Till this day, that abuse car is still FBO on meth and stock turbo. We love that car. It's tuned up to 11, super urgent and ready to fight. Most importantly, it educates me well what M2 stock can do. BTW, on that setup it can barely survive one hard lap at Shanghai International Circuit (F1).
Reason im asking is because the manufacturers i spoken to do not offer a 300 CEL option because it did not show any gains in their R&D tests
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      12-12-2018, 02:11 PM   #58
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Another happy Fabspeed sport cat customer here! I had mine installed yesterday and love it so far. Sound is much improved as is the throttle response. Haven't noticed any difference in power, but I'm sure it's there. Can't wait to test it out in nicer weather!
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      12-18-2018, 01:39 PM   #59
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I installed the Remus DP with 200 cell HJS cat (thanks mike@x-ph.com for a terrific holiday deal). I'm running with the stock catback, and the only other mod is the Dinan Sport Tuner (soon to be replaced with BM3). First, the sound upgrade is fantastic - just a thrilling noise as it climbs in the revs under heavy throttle. Car also feels like it revs more freely and there is a small, but definitely noticeable, power bump.

Remus fitment was spot on, and power with the Sport Tuner is all I need for the street.
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      12-18-2018, 09:44 PM   #60
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Originally Posted by GeilesAuto View Post
I installed the Remus DP with 200 cell HJS cat (thanks mike@x-ph.com for a terrific holiday deal). I'm running with the stock catback, and the only other mod is the Dinan Sport Tuner (soon to be replaced with BM3). First, the sound upgrade is fantastic - just a thrilling noise as it climbs in the revs under heavy throttle. Car also feels like it revs more freely and there is a small, but definitely noticeable, power bump.

Remus fitment was spot on, and power with the Sport Tuner is all I need for the street.
Any cel?
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      12-19-2018, 11:03 AM   #61
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None so far. Have put about 250 miles on it since the install.

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Originally Posted by subliminalaudio View Post
Any cel?
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      12-28-2018, 05:24 PM   #62
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Can’t seem to find the Remus for sale, only the cat back system... any links?
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      12-28-2018, 05:40 PM   #63
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Can’t seem to find the Remus for sale, only the cat back system... any links?
Check your inbox
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      12-28-2018, 05:52 PM   #64
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How would the Remus compare to the fabspeed. Bloody aus tax
Cheaper I assume? I am thinking of paring with fi catback eventually
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      12-29-2018, 03:36 PM   #65
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Can't speak to the fabspeed, but the Remus is definitely a quality piece (as may be expected from an established brand like Remus). Fitment was spot on. Now 750 miles since install, no cel and absolutely loving it.
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      12-30-2018, 11:52 AM   #66
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Quote:
Originally Posted by papertarget View Post
How would the Remus compare to the fabspeed. Bloody aus tax
Cheaper I assume? I am thinking of paring with fi catback eventually
Quote:
Originally Posted by GeilesAuto View Post
Can't speak to the fabspeed, but the Remus is definitely a quality piece (as may be expected from an established brand like Remus). Fitment was spot on. Now 750 miles since install, no cel and absolutely loving it.
Both very high quality and they use the best cats available.

For US customers its easier and cheaper to get Fabspeed
European customer, its REMUS
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