Akrapovic Titanium Exhaust + Down Pipe Installed on my BMW M2 Coupe

Benzima · 09-08-2016, 01:59 PM

Quote:

Originally Posted by 228JB4

Why is there a dent along the left midpipe on the akrapovic?

OEM system has the same dent. Probably due to chassis stiffener location.

c1pher · 09-08-2016, 07:43 PM

I noticed on on the stock mustang exhaust when I replaced it, the aftermarket did not have one and it wasn't due to space. I figured it was due to sound management but never found out for sure.

DealMan · 09-08-2016, 10:31 PM

Did you consider MPE exhaust?

KSAF · 09-09-2016, 06:20 AM

Quote:

Originally Posted by MR.

The second step was installing the Akrapovic exhaust, the down pipe and the gloss carbon fiber diffuser.

What's the cell count of Akra's downpipe with cat?

MR. · 09-12-2016, 04:41 PM

Quote:

Originally Posted by KSAF

What's the cell count of Akra's downpipe with cat?

200 cells

MR

MR. · 09-12-2016, 04:45 PM

Titanium gets purple if you push the car hard... More purple the exhaust, the harder it is been driven!

The Akrapovic exhaust on my car is purple starting at the downpipe and then about 1.5 meters backwards. Really cool!

Let's try to get it completely purple heheheh

MR

dammitcubs · 09-14-2016, 02:24 AM

Wow this is great. Great video and information. The sound is amazing!

gingiman · 09-14-2016, 07:30 AM

Read somewhere that in order to fit the Akra kit u must replace the original diffuser with the one by Akra.

Trur or False?

Anyone?

WheelsBoutique · 09-14-2016, 09:49 AM

Quote:

Originally Posted by gingiman

Read somewhere that in order to fit the Akra kit u must replace the original diffuser with the one by Akra.

Trur or False?

Anyone?

False. The rear diffuser is an option but not a requirement.

HRE_Wheels · 10-04-2016, 10:03 AM

Quote:

Originally Posted by MR.

Titanium gets purple if you push the car hard... More purple the exhaust, the harder it is been driven!

The Akrapovic exhaust on my car is purple starting at the downpipe and then about 1.5 meters backwards. Really cool!

Let's try to get it completely purple heheheh

MR

So cool!!!

SeanWRT · 10-06-2016, 01:47 PM

Quote:

Originally Posted by MR.

200 cells

MR

From the picture, Akra DP is a dual chamber design just like HJS Euro 6 300 cell downpipe. Are you sure it's 200 cell?

paradoxical3 · 10-06-2016, 09:16 PM

This exhaust annoys me because by using two midpipes instead of a single design, they add weight and thus reduce the point of making it out of titanium. $6k for 14lbs savings is not acceptable to me. I can have a custom titanium exhaust fabricated locally for $3k that is much lighter than the Akra one.

MR. · 10-07-2016, 05:30 AM

Quote:

Originally Posted by paradoxical3

This exhaust annoys me because by using two midpipes instead of a single design, they add weight and thus reduce the point of making it out of titanium. $6k for 14lbs savings is not acceptable to me. I can have a custom titanium exhaust fabricated locally for $3k that is much lighter than the Akra one.

Then do it and show us the result

MR

MR. · 10-07-2016, 05:30 AM

Quote:

Originally Posted by SeanWRT

From the picture, Akra DP is a dual chamber design just like HJS Euro 6 300 cell downpipe. Are you sure it's 200 cell?

I thought it was 200 Cell but I can double check if you want?

MR

SeanWRT · 10-07-2016, 06:37 AM

Quote:

Originally Posted by MR.

Quote:

Originally Posted by SeanWRT

From the picture, Akra DP is a dual chamber design just like HJS Euro 6 300 cell downpipe. Are you sure it's 200 cell?

I thought it was 200 Cell but I can double check if you want?

MR

Yes please if possible. I am in the market. And i wonder is the cat even made by HJS?

KSAF · 10-07-2016, 07:25 AM

Quote:

Originally Posted by SeanWRT

From the picture, Akra DP is a dual chamber design just like HJS Euro 6 300 cell downpipe. Are you sure it's 200 cell?

Akra confirmed to me by email that their catted downpipe is 300 cell.

HRE_Wheels · 10-12-2016, 01:54 PM

Quote:

Originally Posted by KSAF

Akra confirmed to me by email that their catted downpipe is 300 cell.

Correct. It's a 300cpsi cat on the M2 system.

MilehighM3 · 10-13-2016, 09:00 AM

Just installed this exhaust over the weekend and it sounds fantastic! As usual the fitment is spot on and the sound clips online do it no justice. No downpipe in my case, yet.

Corinne · 10-14-2016, 04:07 AM

Could someone kindly explain what this cell number business is all about ? Is 300 cell better than 200 cell or wot ?

Corinne · 10-14-2016, 04:20 AM

Ah ok I've found this explanation: "A Catalytic Converter (CAT) is made of many little cells where are deposited high value metals which will take care of oxidizing the gazes that were not fully oxidized in the engine. A 400 CELL Cat means there are 400 of these cells per square inch. As this number goes down, the amount of physical cells decreases therefore generating fewer constraints for the exhaust flows. The good compromise is often to use 200 CELL cats (typically 400cell is what is used by car manufacturers). If we go too low in CELL value, the oxidation process is not well performed. An engine check light will pop up and it is likely that if there is not enough back pressure you will have the same issues described in answer No2".

Robin_NL · 10-14-2016, 05:41 AM

Thanks for the interesting read @Corinne.
I'm a bit exhausted now I have to say.

Cheers
Robin

WheelsBoutique · 10-14-2016, 09:39 AM

Quote:

Originally Posted by Robin_NL

Thanks for the interesting read @Corinne.
I'm a bit exhausted now I have to say.

Cheers
Robin

Haha! It's pretty much like walking a tightrope. Too little cells and check engine light will pop up. Too many cells and exhaust flow is restricted - robbing power.

09-08-2016, 07:43 PM	#24
c1pher Primo Generalissimo 4672 Rep 4,022 Posts Drives: All of them Join Date: Jun 2009 Location: DC area iTrader: (0) Garage List 2017 Porsche 911 Ca ... [10.00] 2023 BMW M2 [9.00] 2023 Porsche Macan GTS [10.00] 2022 Ford F-250 Tremor [8.50]	I noticed on on the stock mustang exhaust when I replaced it, the aftermarket did not have one and it wasn't due to space. I figured it was due to sound management but never found out for sure.
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09-08-2016, 10:31 PM	#25
DealMan Private 53 Rep 67 Posts Drives: 2020 M2 CS Join Date: Nov 2011 Location: Bay Area, CA iTrader: (1)	Did you consider MPE exhaust? __________________ M2 CS: (HS – 6MT – M-CCB – GLD 763M – Cup2)
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09-12-2016, 04:45 PM	#28
MR. Colonel 4398 Rep 2,856 Posts Drives: BMW M2 CSL Turbomeister Join Date: Sep 2013 Location: Travelling / Managing / Writing iTrader: (0) Garage List 2020 MINI GP3 [0.00] 2013 MINI GP2.5 [8.50] 2018 BMW M2 Competi ... [10.00]	And it is purple... Titanium gets purple if you push the car hard... More purple the exhaust, the harder it is been driven! The Akrapovic exhaust on my car is purple starting at the downpipe and then about 1.5 meters backwards. Really cool! Let's try to get it completely purple heheheh MR Attached Images
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09-14-2016, 02:24 AM	#29
dammitcubs Captain 584 Rep 689 Posts Drives: '16 M2 LBB Join Date: Oct 2015 Location: San Jose iTrader: (0)	Wow this is great. Great video and information. The sound is amazing!
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09-14-2016, 07:30 AM	#30
gingiman Enlisted Member 32 Rep 42 Posts Drives: M2,6MT,MG Join Date: Feb 2013 Location: Tel-Aviv iTrader: (0)	Read somewhere that in order to fit the Akra kit u must replace the original diffuser with the one by Akra. Trur or False? Anyone?
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10-06-2016, 09:16 PM	#34
paradoxical3 Lieutenant Colonel 1008 Rep 1,563 Posts Drives: BMW Join Date: Mar 2012 Location: USA iTrader: (6)	This exhaust annoys me because by using two midpipes instead of a single design, they add weight and thus reduce the point of making it out of titanium. $6k for 14lbs savings is not acceptable to me. I can have a custom titanium exhaust fabricated locally for $3k that is much lighter than the Akra one.
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10-13-2016, 09:00 AM	#40
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Just installed this exhaust over the weekend and it sounds fantastic! As usual the fitment is spot on and the sound clips online do it no justice. No downpipe in my case, yet.
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10-14-2016, 04:07 AM	#41
Corinne Captain 1171 Rep 709 Posts Drives: M2 2018 LBB 6MT Join Date: Feb 2015 Location: French Alps iTrader: (0)	Could someone kindly explain what this cell number business is all about ? Is 300 cell better than 200 cell or wot ? __________________ 2011 Lotus Elise SC, 2002 BMW 330d, 1990 Caterham Super 7 HPC (sold), 1985 Porsche 911 Carrera SC (sold), 1978 Caterham Super 7 (sold), 1972 Triumph TR6 (sold), 1972 Jensen Healey (sold), 1965 Triumph TR4A (sold)
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10-14-2016, 04:20 AM	#42
Corinne Captain 1171 Rep 709 Posts Drives: M2 2018 LBB 6MT Join Date: Feb 2015 Location: French Alps iTrader: (0)	Ah ok I've found this explanation: "A Catalytic Converter (CAT) is made of many little cells where are deposited high value metals which will take care of oxidizing the gazes that were not fully oxidized in the engine. A 400 CELL Cat means there are 400 of these cells per square inch. As this number goes down, the amount of physical cells decreases therefore generating fewer constraints for the exhaust flows. The good compromise is often to use 200 CELL cats (typically 400cell is what is used by car manufacturers). If we go too low in CELL value, the oxidation process is not well performed. An engine check light will pop up and it is likely that if there is not enough back pressure you will have the same issues described in answer No2". __________________ 2011 Lotus Elise SC, 2002 BMW 330d, 1990 Caterham Super 7 HPC (sold), 1985 Porsche 911 Carrera SC (sold), 1978 Caterham Super 7 (sold), 1972 Triumph TR6 (sold), 1972 Jensen Healey (sold), 1965 Triumph TR4A (sold)
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10-14-2016, 05:41 AM	#43
Robin_NL S0THPAW 8717 Rep 7,846 Posts Drives: HS M2 Competition Join Date: Apr 2005 Location: The Netherlands iTrader: (0)	Thanks for the interesting read @Corinne. I'm a bit exhausted now I have to say. Cheers Robin
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