Performance exhaust burble

wa128 · 07-06-2009, 08:29 AM

Anyone know why the performance exhaust burbles when you let off the throttle to slow down? It doesn't do this immediately; just when the engine reaches low rpms. Sounds nice and throaty on the throttle singing a glorious song then sounds like it's sputtering when you let go. Any fixes for this? Thanks.

SoQuick · 07-06-2009, 09:03 AM

Its normal, someone else can explain how it happens, I can't.

BrokenVert · 07-06-2009, 11:23 AM

Its a result of backpressure from the engine escaping through the responator.

And I love it too.

Just a quick OT. Does anybody else's perf exhaust Backfire on hard 1-2 and 2-3 shifts? Mine does every time.

wa128 · 07-06-2009, 12:02 PM

It's just strange that the stock exhaust rumbles softly then turns into a hum as the car comes to a stop. I thought the performance exhaust would exhibit the same characteristic albeit at a louder volume. For a while I thought the engine was misfiring although it's not a sharp popping sound.

Double Nick · 07-06-2009, 12:12 PM

I wish it was louder. My '05 MCS had a Magnaflow exhaust. Lots of popping. I won't even talk about my SLP Loudmouth exhausts (straight pipes I had on my '01 Vette and my '98 Z28). I do like the peformance exhaust--ofcourse I wouldn't complain if it was louder. Nick

wa128 · 07-06-2009, 12:23 PM

So, based on everyone's experiences there's nothing wrong mechanically...that's good to know. Thanks guys!

SV Concepts III · 07-06-2009, 12:36 PM

Completely normal for an aftermarket exhaust, my Riss has a nice burble that I love.

///M1 · 07-06-2009, 12:39 PM

Def normal. All my aftermarket exhausts on my cars have exhibited this, in fact the Milltek on my RS4 more than the Supersprint on my M5 (even though both were with the resonator eliminated). It's awesome, and I miss it! Put in a check mark under the 'plus' column for the BMW Performance exhaust!

If you drove the Mini Copper JCW it does the same. In fact, it has been claimed that the manufacturer of the BMW Performance exhaust is indeed John Cooper Works, so wouldn't be surprised if both exhibit similar characteristics!

JimBeemer · 07-06-2009, 12:52 PM

Quote:

Originally Posted by BrokenVert

Just a quick OT. Does anybody else's perf exhaust Backfire on hard 1-2 and 2-3 shifts? Mine does every time.

Mine does this but only the first 2 shifts out of the garage. Once warmed up it doesnt.

ru55 · 07-07-2009, 05:14 AM

Mine backfires too when the engines cold, on 1st and 2nd. Once warmed up this stops.

BrokenVert · 07-07-2009, 09:30 AM

Quote:

Originally Posted by JimBeemer

Mine does this but only the first 2 shifts out of the garage. Once warmed up it doesnt.

Quote:

Originally Posted by ru55

Mine backfires too when the engines cold, on 1st and 2nd. Once warmed up this stops.

Maybe its the curse of an auto trans for me then? If I launch hard and hit every shift at around 6500 the car backfires every single time. But it only does it when I start from a standstill. Its so odd...but I do love it.

m7ammed · 07-07-2009, 11:21 AM

I love the sound 4 weeks now and I love hearing it everyday

trfortin69 · 07-07-2009, 12:13 PM

Quote:

Originally Posted by wa128

So, based on everyone's experiences there's nothing wrong mechanically...that's good to know. Thanks guys!

no nothing wrong with it, even my stock sport exhaust does it. perhaps not as loud at the performance one but it does it.

Formel1 · 07-15-2009, 08:56 AM

Burbles...now you are going to make my decision easy for the performance exhaust.. +1

07-06-2009, 08:29 AM	#1
wa128 Second Lieutenant 18 Rep 214 Posts Drives: 2012 AW 135i DCT Join Date: Apr 2008 Location: wa state iTrader: (0)	Performance exhaust burble Anyone know why the performance exhaust burbles when you let off the throttle to slow down? It doesn't do this immediately; just when the engine reaches low rpms. Sounds nice and throaty on the throttle singing a glorious song then sounds like it's sputtering when you let go. Any fixes for this? Thanks. __________________ 2012 135i \| AW on Blk \| 7DCT \| M-Sport + Premium \| Nav \| Harmon Kardon \| BMW Performance Exhaust & Kidney Grilles
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07-06-2009, 09:03 AM	#2
SoQuick Stock 10 Rep 243 Posts Drives: Nothing now Join Date: Nov 2008 Location: Southern NH iTrader: (0) Garage List 2009 135i [0.00] 2001 S8 [0.00]	Its normal, someone else can explain how it happens, I can't.
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07-06-2009, 11:23 AM	#3
BrokenVert Resident Kerbalnaut 477 Rep 10,703 Posts Drives: Topless Brute/Hybrid Boogaloo Join Date: Apr 2009 Location: Fahrvergnügen/NY iTrader: (0)	Its a result of backpressure from the engine escaping through the responator. And I love it too. Just a quick OT. Does anybody else's perf exhaust Backfire on hard 1-2 and 2-3 shifts? Mine does every time. __________________
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07-06-2009, 12:02 PM	#4
wa128 Second Lieutenant 18 Rep 214 Posts Drives: 2012 AW 135i DCT Join Date: Apr 2008 Location: wa state iTrader: (0)	It's just strange that the stock exhaust rumbles softly then turns into a hum as the car comes to a stop. I thought the performance exhaust would exhibit the same characteristic albeit at a louder volume. For a while I thought the engine was misfiring although it's not a sharp popping sound. __________________ 2012 135i \| AW on Blk \| 7DCT \| M-Sport + Premium \| Nav \| Harmon Kardon \| BMW Performance Exhaust & Kidney Grilles
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07-06-2009, 12:12 PM	#5
Double Nick Private 16 Rep 84 Posts Drives: 135i Man/CR/Taupe. 5/08/09 Join Date: Mar 2009 Location: Tallahassee, FL iTrader: (0)	I wish it was louder. My '05 MCS had a Magnaflow exhaust. Lots of popping. I won't even talk about my SLP Loudmouth exhausts (straight pipes I had on my '01 Vette and my '98 Z28). I do like the peformance exhaust--ofcourse I wouldn't complain if it was louder. Nick __________________ '09 128 BSM-Taupe/AT("Snoppy") my wife's. '09 135 CR-Taupe/MT/BMW Performance Exhaust("Red Baron") my bad boy. Peacefully sharing the same garage.
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07-06-2009, 12:23 PM	#6
wa128 Second Lieutenant 18 Rep 214 Posts Drives: 2012 AW 135i DCT Join Date: Apr 2008 Location: wa state iTrader: (0)	So, based on everyone's experiences there's nothing wrong mechanically...that's good to know. Thanks guys! __________________ 2012 135i \| AW on Blk \| 7DCT \| M-Sport + Premium \| Nav \| Harmon Kardon \| BMW Performance Exhaust & Kidney Grilles
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07-06-2009, 12:36 PM	#7
SV Concepts III Lieutenant General 375 Rep 17,017 Posts Drives: BMW Duh Join Date: Apr 2005 Location: Santa Clara iTrader: (13)	Completely normal for an aftermarket exhaust, my Riss has a nice burble that I love.
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07-06-2009, 12:39 PM	#8
///M1 Brigadier General 275 Rep 3,164 Posts Drives: Many Join Date: Feb 2009 Location: North of 7K RPM iTrader: (1) Garage List 2020 BMW M2 CS [0.00] 1994 Audi RS2 Avant [0.00] 2021 Audi RS6 Avant [0.00] 1988 BMW E30 M3 [0.00] 2011 BMW 1///M [0.00] 2017 BMW F80 M3 30 ... [0.00] 2018 Porsche 991.2 GT3 [0.00] 2015 Porsche Macan ... [0.00] 1998 Porsche 993 C4S [0.00] 1994 Lancia Delta I ... [0.00] 2008 Audi RS4 [0.00]	Def normal. All my aftermarket exhausts on my cars have exhibited this, in fact the Milltek on my RS4 more than the Supersprint on my M5 (even though both were with the resonator eliminated). It's awesome, and I miss it! Put in a check mark under the 'plus' column for the BMW Performance exhaust! If you drove the Mini Copper JCW it does the same. In fact, it has been claimed that the manufacturer of the BMW Performance exhaust is indeed John Cooper Works, so wouldn't be surprised if both exhibit similar characteristics! __________________ *2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods 1988 BMW E30 M3: Hennarot, S14, stock 2018 Porsche 991.2 GT3: PtS, CXX, LWBS, PCCB 1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust 2008 Audi B7 RS 4*: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods
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07-07-2009, 05:14 AM	#10
ru55 Private 7 Rep 82 Posts Drives: 135 Join Date: Aug 2008 Location: Worcestershire. UK iTrader: (0)	Mine backfires too when the engines cold, on 1st and 2nd. Once warmed up this stops.
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07-07-2009, 11:21 AM	#12
m7ammed Captain 210 Rep 959 Posts Drives: 2019 M2 Competition Join Date: Nov 2008 Location: Saudi Arabia iTrader: (0)	I love the sound 4 weeks now and I love hearing it everyday __________________ Instgram: @m7m_photo
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07-15-2009, 08:56 AM	#14
Formel1 Second Lieutenant 47 Rep 257 Posts Drives: 2009 BMW 135i Join Date: Jul 2009 Location: Winter Park, FL iTrader: (1)	Burbles...now you are going to make my decision easy for the performance exhaust.. +1
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