Exhaust Mod(s) - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

bmw13 · 12-12-2011, 03:50 PM

I am completely stock and was thinking of doing one of four options: I want to modify only if I gain power or do not lose power, what is the best route to go and why?

1) akraprovic down pipe

2) akraprovic downpipe and 2ndary cat delete

3) 2ndary cat delete
Or
4) just don\'t touch it, what BMW did stock is the best for a stock car

Juiced1M · 12-12-2011, 03:51 PM

Quote:

Originally Posted by bmw13

I am completely stock and was thinking of doing one of four options: I want to modify only if I gain power or do not lose power, what is the best route to go and why?

1) akraprovic down pipe

2) akraprovic downpipe and 2ndary cat delete

3) 2ndary cat delete
Or
4) just don\'t touch it, what BMW did stock is the best for a stock car

Guess you have some seriously deep pockets

bmw13 · 12-12-2011, 03:58 PM

Quote:

Originally Posted by Juiced1M

Quote:

Originally Posted by bmw13

I am completely stock and was thinking of doing one of four options: I want to modify only if I gain power or do not lose power, what is the best route to go and why?

1) akraprovic down pipe

2) akraprovic downpipe and 2ndary cat delete

3) 2ndary cat delete
Or
4) just don\'t touch it, what BMW did stock is the best for a stock car

Guess you have some seriously deep pockets

Not that deep lol their downpipe is $800 if I am not mistaken

sparoz · 12-12-2011, 04:10 PM

Bang for buck = DP. However, you will need to get a tune as well for the CEL.

Rich@GTBPerformance · 12-12-2011, 04:23 PM

The downpipes will give you a great bang for the buck power increase. Eliminating the primary cats right near the turbos will yield the biggest power boost. Mid Cat elimination will not increase power as much.

Also the smell might not be too appealing! You will definitely need a tune to eliminate the CEL. Most aftermarket tune options out there have the ability to block the signal from the affected O2 sensor.

You'll definitely see a nice power increase from going with Tune + DP's

bmw13 · 12-12-2011, 05:14 PM

Quote:

Originally Posted by Rich@GTBPerformance

The downpipes will give you a great bang for the buck power increase. Eliminating the primary cats right near the turbos will yield the biggest power boost. Mid Cat elimination will not increase power as much.

Also the smell might not be too appealing! You will definitely need a tune to eliminate the CEL. Most aftermarket tune options out there have the ability to block the signal from the affected O2 sensor.

You'll definitely see a nice power increase from going with Tune DP's

Honestly the car is fast enough for me, and I just wanted to uncork some of the suppressed sound. I don't care for gaining power as much as I care about losing it! Definitely do not want to lose any! Thanks for the help! With that said about losing power, what do you guys think? Thanks again this is all much appreciated!

Fundahl · 12-12-2011, 06:12 PM

Do it. DPs and mids will sound great with stock catback!

bklounge · 12-12-2011, 06:42 PM

Quote:

Originally Posted by bmw13

Honestly the car is fast enough for me, and I just wanted to uncork some of the suppressed sound. I don't care for gaining power as much as I care about losing it! Definitely do not want to lose any! Thanks for the help! With that said about losing power, what do you guys think? Thanks again this is all much appreciated!

Just a heads up, the akra dp is DOUBLING (2x) in price Jan 1/2012.

EIN M · 12-12-2011, 07:07 PM

Quote:

Originally Posted by bklounge

Just a heads up, the akra dp is DOUBLING (2x) in price Jan 1/2012.

Is that a fact?!!

bklounge · 12-12-2011, 09:26 PM

Quote:

Originally Posted by EIN M

Is that a fact?!!

Yup.

RaihaX · 12-12-2011, 09:30 PM

why would they do that?!?! $1600 for DP!??!

Ian///M · 12-13-2011, 05:54 AM

Quote:

Originally Posted by bklounge

Just a heads up, the akra dp is DOUBLING (2x) in price Jan 1/2012.

HPW said ~5% increase, not doubling. It is almost un-affordable at the moment

BMW Gator · 12-13-2011, 08:41 AM

Quote:

Originally Posted by bklounge

Yup.

Source?

bmw13 · 12-13-2011, 09:40 AM

Quote:

Originally Posted by RaihaX

why would they do that?!?! $1600 for DP!??!

Than what should I do?!? Im going to get my black chrome "///M3 edition" tips welded on within the next week and wanted to get any other work on the exahust out of the way...

Muffler delete? I obviously do not understand how the exhaust works on force induction engines lol hence why I am seeking help! I do not want to make the car slower to make it a little louder. What will the car love as well as myself? What is the best way to mod a stock exhuast on our cars, where it betters the car? I do not want to start buchering my exhuast... I just wish it wasnt so muffled! I do not want to start cut parts of my exhaust out if my car will suffer from it... What is typically done to get the results I am looking for? How would an M engineer modify their exhaust if it were their 1M? and in a somewhat BMW approved manner lol

On my 135 I deleted the secondary cats but had the JB+. When I took out the tune and left the exhaust catless I felt like I lost a lot of that low end torque(huge reason why I love this car) when compared to the stock set up. This is why I am so skeptical... Help!!

Fundahl · 12-13-2011, 10:55 AM

Reducing backpressure on turbo-charged motors does not decrease torque ANYWHERE in the RPM range of the motor.

That being said, if you want actual functional mods (power) that also are pleasing to the ear, get catless down and mid pipes.

BMW Gator · 12-13-2011, 11:27 AM

Personally, I would start with the mid pipe first. Easy, fast and inexpensive and doesn't require a tune. The existing rear OEM resonator is not very restrictive. Then next step is catless DP's with a tune.

bmw13 · 12-13-2011, 11:42 AM

Quote:

Originally Posted by BMW Gator

Personally, I would start with the mid pipe first. Easy, fast and inexpensive and doesn't require a tune. The existing rear OEM resonator is not very restrictive. Then next step is catless DP's with a tune.

great! do you mind explaining the easy, fast and inexpensive part lol

BMW Gator · 12-13-2011, 12:06 PM

Quote:

Originally Posted by bmw13

great! do you mind explaining the easy, fast and inexpensive part lol

Start with this:

http://www.1addicts.com/forums/showthread.php?t=619288

Then do a search on mid pipe, Berk

There is a lot of info on this here and on other sites as well.

bklounge · 12-13-2011, 09:26 PM

Quote:

Originally Posted by BMW Gator

Source?

Ask any Akra vendor on the forum.

BMW86 · 12-13-2011, 09:36 PM

Quote:

Originally Posted by bklounge

Ask any Akra vendor on the forum.

Harold from HPA.

BMW Gator · 12-13-2011, 10:29 PM

Quote:

Originally Posted by ianf

HPW said ~5% increase, not doubling. It is almost un-affordable at the moment

Quote:

Originally Posted by BMW86

Harold from HPA.

-confirmed the doubling?

So what is the truth

Are the Akra DP's going up 5% or doubling??

bklounge · 12-13-2011, 11:30 PM

Quote:

Originally Posted by BMW Gator

-confirmed the doubling?

So what is the truth

Are the Akra DP's going up 5% or doubling??

This is the exact quote I received from a vendor:

"Thanks for the email. Good timing on purchasing the exhaust, Akrapovic is increasing their prices Jan 1/2012 by 5% and the Bmw 1M downpipe price was underestimated pre-production and will be increased by double Jan 1/2012"

I could've been fed BS but I doubt it, especially since the 5% increase aligns with what has already been confirmed.

12-12-2011, 03:50 PM	#1
bmw13 Captain Drives: 1M - GIAC:S2 Join Date: Jul 2009 Location: Boca Raton, FL Posts: 636 iTrader: (0)	Exhaust Mod(s) I am completely stock and was thinking of doing one of four options: I want to modify only if I gain power or do not lose power, what is the best route to go and why? 1) akraprovic down pipe 2) akraprovic downpipe and 2ndary cat delete 3) 2ndary cat delete Or 4) just don\'t touch it, what BMW did stock is the best for a stock car __________________ 2011 E82 1M #215 of 740 http://www.1addicts.com/forums/showthread.php?t=789009
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12-12-2011, 04:10 PM	#4
sparoz Brigadier General Drives: VO 1///M; AW X3 30d Join Date: Jun 2008 Location: Sunshine Coast Posts: 4,524 iTrader: (0)	Bang for buck = DP. However, you will need to get a tune as well for the CEL. __________________ 1///M - Valencia Orange X3 30d - Alpine White Under Six Seconds http://www.under6s.com

12-12-2011, 04:23 PM	#5
Rich@GTBPerformance Bimmerpost Gold Supporting Vendor Drives: A hard bargain Join Date: Dec 2010 Location: Northern NJ Posts: 6,434 iTrader: (4)	The downpipes will give you a great bang for the buck power increase. Eliminating the primary cats right near the turbos will yield the biggest power boost. Mid Cat elimination will not increase power as much. Also the smell might not be too appealing! You will definitely need a tune to eliminate the CEL. Most aftermarket tune options out there have the ability to block the signal from the affected O2 sensor. You'll definitely see a nice power increase from going with Tune + DP's __________________ Your Home For Premium BMW Aftermarket Parts www.gtbperformance.com \| sales@gtbperformance.com \| Facebook \| 973 429 2839

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12-12-2011, 06:12 PM	#7
Fundahl Captain Drives: VO 1M, 300zx TT Join Date: Mar 2011 Location: Corpus Christi, Texas Posts: 705 iTrader: (0)	Do it. DPs and mids will sound great with stock catback!

12-12-2011, 09:30 PM	#11
RaihaX Major General Drives: 08' 135i Join Date: Aug 2008 Location: Australia, Perth Posts: 5,030 iTrader: (2)	why would they do that?!?! $1600 for DP!??!

12-13-2011, 10:55 AM	#15
Fundahl Captain Drives: VO 1M, 300zx TT Join Date: Mar 2011 Location: Corpus Christi, Texas Posts: 705 iTrader: (0)	Reducing backpressure on turbo-charged motors does not decrease torque ANYWHERE in the RPM range of the motor. That being said, if you want actual functional mods (power) that also are pleasing to the ear, get catless down and mid pipes.

12-13-2011, 11:27 AM	#16
BMW Gator Private First Class Drives: 1M/e90/GTS/Rubicon/FJ40/+ Join Date: Apr 2010 Location: Florida Posts: 164 iTrader: (0)	Personally, I would start with the mid pipe first. Easy, fast and inexpensive and doesn't require a tune. The existing rear OEM resonator is not very restrictive. Then next step is catless DP's with a tune.