Clinking Exhaust

BMWRX · 11-09-2009, 11:41 PM

I've been told our exhausts have a butterfly valve in them to aid with maintain backpressure, etc and therefore help performance. However, just recently I've noticed that mine makes a definite clinking noise when it opens and closes (ie. turn the car on and stand behind it listening to it idle, and after about a minute or two, Clink, and the idle cadence changes). Now, it may have always made that noise, but I've only just noticed it in the last week. Any thoughts or comments?

bobbynoway · 11-10-2009, 02:41 AM

Your observations are spot on.
There is a simple mod which makes the valve permanently open for a bit more sound.
Search "Golf Tee mod" in the DYI section.

BMWRX · 11-10-2009, 04:12 PM

Thanks bobbynoway. I don't want to change the sound of the exhaust, just wanted to know if the clink of the exhaust should be so noticeable. I quite like that the exhaust note settles down after the initial warm up, so all is good.

11-09-2009, 11:41 PM	#1
BMWRX Major 98 Rep 1,092 Posts Drives: F82 M4 CP Join Date: Jul 2009 Location: Brisbane, Queensland iTrader: (0) Garage List 2017 BMW M4 [0.00]	Clinking Exhaust I've been told our exhausts have a butterfly valve in them to aid with maintain backpressure, etc and therefore help performance. However, just recently I've noticed that mine makes a definite clinking noise when it opens and closes (ie. turn the car on and stand behind it listening to it idle, and after about a minute or two, Clink, and the idle cadence changes). Now, it may have always made that noise, but I've only just noticed it in the last week. Any thoughts or comments? __________________ 2017 BMW M4 Competition - Mineral Grey 2009 BMW 135i - Titan Silver - SOLD
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11-10-2009, 02:41 AM	#2
bobbynoway Private First Class 5 Rep 186 Posts Drives: 135i Join Date: Feb 2009 Location: Sydney iTrader: (0)	Your observations are spot on. There is a simple mod which makes the valve permanently open for a bit more sound. Search "Golf Tee mod" in the DYI section.
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11-10-2009, 04:12 PM	#3
BMWRX Major 98 Rep 1,092 Posts Drives: F82 M4 CP Join Date: Jul 2009 Location: Brisbane, Queensland iTrader: (0) Garage List 2017 BMW M4 [0.00]	Thanks bobbynoway. I don't want to change the sound of the exhaust, just wanted to know if the clink of the exhaust should be so noticeable. I quite like that the exhaust note settles down after the initial warm up, so all is good. __________________ 2017 BMW M4 Competition - Mineral Grey 2009 BMW 135i - Titan Silver - SOLD
	Appreciate 0 Quote