[GrumpyBimmerFan]

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So naturally adding a tune (BM3 or something) is the most bang for the buck. however, even if you remove the tune, if anything happens (I'm looking at you crank hub bearing) the BMW will likely not warranty the work (I haven't heard any recent stories of warranty work on cars that used to have tunes).

450hp is nice, but... for many/some of us its just not enough. So, what mods can we do that are reversible, and add HP? In the old days a simple CAI could add 20-30 hp (on turbo car), but nowadays it seems like ECU compensates for added air, so from my understanding the CAI adds close to 0 HP (aside from the fact that its likely sucking hot air from the engine bay, thus prob even reduces the herspers).

Catback is like 5hp, so bang for buck its not all that attractive. Midpipe? Charge pipes? whats the numbers on that?

[detroitm2]

Nothing is going to add any significant amount of power without a tune.

[mchart]

None do much without re-tuning. The best thing you can do that wouldn't be noticeable if you reversed it, would be upgrading the air-to-water heat exchanger & radiator just for the increased thermals. This would allow you to retain the power available for longer in hot conditions.

Anything else that would add real power numbers is going to demolish your warranty, and personally, I don't see the point of paying the money for the CS if you are going to mod the powertrain on it. You already have a factory 450HP (Closer to 500HP as tested by 3rd party).

[ptgltw]

I have submitted your request along with your screen name to Bmw North America. We will be in touch

In all seriousness thou. Tune an OG or M2C to be faster than the CS but don’t tune the CS.

Maybe 5 years down the road

[AlpsRider]

Everyone has their own power wants/needs. The M2 CS tune is plenty fast for the stock chassis. You can drag out over 500 ft lb of torque with a stage 1 tune but the stock chassis just doesn't handle the torque that well.

[GrumpyBimmerFan]

Originally Posted by AlpsRider

Everyone has their own power wants/needs. The M2 CS tune is plenty fast for the stock chassis. You can drag out over 500 ft lb of torque with a stage 1 tune but the stock chassis just doesn't handle the torque that well.

The m2 comp with BM3 with OTS GTS tune was just perfect. It handled the power extremely well, and didn't overburden it. Same story on the track. STG1 was a bit much (Id say it was jerky), it'd spin tires if you floor it in 2nd at 30mph (was fun, but not practical). GTS was rated at around 500hp.

I haven't broken my car in yet, so I don't know what it'll be like above 5k rpm (the m2 comp was flat in stock form), so I really hope its close to that GTS tune.... I have a feeling it'll be short.

I was thinking of doing a mid pipe... its fairly easy to swap back to stock, and hypothetically, removing the cats should add 15-20hp. Or would the ECU compensate for the removal? Or would I get a CEL?

[homemade_f81]

Originally Posted by kotik

The m2 comp with BM3 with OTS GTS tune was just perfect. It handled the power extremely well, and didn't overburden it. Same story on the track. STG1 was a bit much (Id say it was jerky), it'd spin tires if you floor it in 2nd at 30mph (was fun, but not practical). GTS was rated at around 500hp.

I haven't broken my car in yet, so I don't know what it'll be like above 5k rpm (the m2 comp was flat in stock form), so I really hope its close to that GTS tune.... I have a feeling it'll be short.

I was thinking of doing a mid pipe... its fairly easy to swap back to stock, and hypothetically, removing the cats should add 15-20hp. Or would the ECU compensate for the removal? Or would I get a CEL?

Mid-pipe upgrade will only eliminate the secondary cats and won't trigger a CEL since the ECU doesn't monitor them. Since you still retain your primary cats, I'd expect that you wouldn't see big gains but definitely more than a CAI. And it will sound a bit more aggressive...

[AlpsRider]

Originally Posted by kotik

The m2 comp with BM3 with OTS GTS tune was just perfect. It handled the power extremely well, and didn't overburden it. Same story on the track. STG1 was a bit much (Id say it was jerky), it'd spin tires if you floor it in 2nd at 30mph (was fun, but not practical). GTS was rated at around 500hp.

I haven't broken my car in yet, so I don't know what it'll be like above 5k rpm (the m2 comp was flat in stock form), so I really hope its close to that GTS tune.... I have a feeling it'll be short.

I was thinking of doing a mid pipe... its fairly easy to swap back to stock, and hypothetically, removing the cats should add 15-20hp. Or would the ECU compensate for the removal? Or would I get a CEL?

If your car isn't broken in yet then the torque monster isn't even awake yet. That being said maybe the adaptive dampers of the CS makes a big difference in handling high torque.

[MadBimmeRad]

As far as I have read, as of June 25 last year, all Bosch ECUs used in BMWs (including the M2 CS) are locked and cannot be tuned unless they are bench flashed (and even that possess it's own challenges too)

[GrumpyBimmerFan]

Originally Posted by MadBimmeRad

As far as I have read, as of June 25 last year, all Bosch ECUs used in BMWs (including the M2 CS) are locked and cannot be tuned unless they are bench flashed (and even that possess it's own challenges too)

a local shop unlocked it for me, took like 30 minutes (no ecu removal).

[CarJunkie]

Originally Posted by kotik

a local shop unlocked it for me, took like 30 minutes (no ecu removal).

Will this be discoverable when you take the car in for warranty work?

[GrumpyBimmerFan]

Originally Posted by CarJunkie

Will this be discoverable when you take the car in for warranty work?

yes. I just traded my comp in, and have removed the bm3 and had the car turned back to stock, the dealer just called and asked if the car was tuned/they saw that it was tuned before.

[mchart]

Originally Posted by CarJunkie

Will this be discoverable when you take the car in for warranty work?

Yes. It's clearly visible as soon as a tech plugs into your car and does a quick on-board & diagnostic scan. As soon as this happens your VIN will be flagged, forevermore.

[CarJunkie]

Originally Posted by kotik

yes. I just traded my comp in, and have removed the bm3 and had the car turned back to stock, the dealer just called and asked if the car was tuned/they saw that it was tuned before.

I guess if you have traded the car in, it doesn't matter. I do kind of feel bad for the next guy though.

It was so much more fun when we could play and no one knew.

[GrumpyBimmerFan]

Originally Posted by CarJunkie

I guess if you have traded the car in, it doesn't matter. I do kind of feel bad for the next guy though.

It was so much more fun when we could play and no one knew.

most of m2c have a tune. its only a problem if there is an engine problem, which is unlikely.

[robertm]

It presents an interesting problem and one to be extremely cautious of when buying on the used market. I would not buy from anyone outside of BMW dealership without first taking the car to a BMW dealer and confirming, in writing, there is nothing flagged which would cause loss of future warranty work.

[mchart]

Originally Posted by robertm

It presents an interesting problem and one to be extremely cautious of when buying on the used market. I would not buy from anyone outside of BMW dealership without first taking the car to a BMW dealer and confirming, in writing, there is nothing flagged which would cause loss of future warranty work.

Same issue with any performance car, really. Seen it a number of times w/ second-hand Hellcat buyers being screwed because the supercharger grenades itself because the prior owner installed a pulley or had a tune.

Generally, if the dealer is selling the car as CPI you'll know the warranty is still intact and not tuned. Removal of a tune doesn't change the fact that the flash counter is changed. If the flash counter is changed and a BMW service center scans your car; It's immediately flagged if the count doesn't match official service updates.

If a relatively still new car is being sold at a BMW dealer as used, but not CPI, that's an immediate red flag.

[SEAT TIME RULES]

Originally Posted by kotik

a local shop unlocked it for me, took like 30 minutes (no ecu removal).

If your car was built before 6/2020 it can be bench unlocked. After that as far as I have been able to read its 100% locked. Only a piggy back will work.

So we really want to know your build date..

[M1rider]

Originally Posted by SEAT TIME RULES

If your car was built before 6/2020 it can be bench unlocked. After that as far as I have been able to read its 100% locked. Only a piggy back will work.

So we really want to know your build date..

I have an M2C that had to be unlocked to tune with BM3. Trading in my M2C tomorrow for my CS. Assuming I will be doing the same process on the CS.

The car can be tuned, there is just an extra step to unlock the DME. Piggybacks are not the only option.

[mchart]

Originally Posted by M1rider

I have an M2C that had to be unlocked to tune with BM3. Trading in my M2C tomorrow for my CS. Assuming I will be doing the same process on the CS.

The car can be tuned, there is just an extra step to unlock the DME. Piggybacks are not the only option.

Unless you know something that no-one else does, it's not going to happen. Dinan, etc, no one offers a solution for the current issue. It's not the same process for a US market CS. It's completely locked down now. So unless your tuner is going to swap in an older ECU, or use a piggyback solution, you aren't getting tuned.

[M1rider]

Originally Posted by mchart

Unless you know something that no-one else does, it's not going to happen. Dinan, etc, no one offers a solution for the current issue. It's not the same process for a US market CS. It's completely locked down now. So unless your tuner is going to swap in an older ECU, or use a piggyback solution, you aren't getting tuned.

Unless there is a newer issue than the DMEs now being locked from production years 2019 and beyond ??

I got my M2 Competition in July of 2020 and unlocked it with my local shop than tuned it on BM3.

Is there possibly a now different/newer issue?

[mchart]

Originally Posted by M1rider

Unless there is a newer issue than the DMEs now being locked from production years 2019 and beyond ??

I got my M2 Competition in July of 2020 and unlocked it with my local shop than tuned it on BM3.

Is there possibly a now different/newer issue?

Yes. It's completely locked down now as of June of 2020. If you received your M2C last July, it was built before the June changeover.