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      08-19-2013, 09:43 AM   #24
AlphaAlpineM6
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Drives: 2014 BMW M6 & 2012 AMG CLS63
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Quote:
Originally Posted by F12M6MD View Post
Hey Alpha,

I got my Meisterschaft GTC installed at 1200 miles. I do not remember hearing any rattling at all before that time. After installation of the cat-back exhaust, I did note hearing some rattling in the 900-1200rpm range as the car was transitioning to idle. It was gone at idle.

After installing downpipes, this sound became amplified. I can hear it while driving at all speeds (most revs below 4000rpm; above that exhaust dominates all) always when revs are coming down (decelerating). This happens at all engine temps. I feel like there are two places it occurs. Coming down off revs, then it sort of goes away, but then returns just as the car is coming down to idle (coasting). Either way, it is louder, annoying and making me consider removing the downpipes. I have read it could either be a turbo/wastegate issue or just the actuators. I am going to take my car in next week to have them look at that specific issue.

Mark
Hi Mark - I won't speculate on something I haven't heard in person but, it sounds like something is loose - perhaps a clamp or heat shield.

Maybe even fitment issues from downpipe to Meisterschaft GTC.
Let us know once you get things checked out.

Anyone else having similar issues with their downpipes?
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2008 M3 Sedan + catless + Tune
2012 CLS63 AMG
2014 M6 Coupe + catless + KW V3
2015 Porsche GT3
, 2015 M3, all stock, 1/1 Space Grey
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