BMW M3 Forum (E90 E92) - View Single Post

Definitive · 07-16-2014, 06:56 PM

It's valves before the muffler that dumps the exhaust when you want to. It's adjustable all the way from stock to fing monster mode, all with a push of a button!

07-16-2014, 06:56 PM	#8
Definitive definitivecars.com 353 Rep 3,833 Posts Drives: Elsa - 2015 F80 M3 - YMB/SS Join Date: Aug 2006 Location: So Cal iTrader: (3) Garage List 2011 E90 M3 [6.66] 2009 (Lease up Sept ... [0.00] 2007 (Lease up 6/19 ... [0.00] 2007 (Lease up Octo ... [0.00]	It's valves before the muffler that dumps the exhaust when you want to. It's adjustable all the way from stock to fing monster mode, all with a push of a button!
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