Quote:
Originally Posted by VolcomFrenzy
You're kidding me right? I really have no idea why you cant on his 325i, but you can on our 335i's only. I thought all BMW exhausts comes with the butterly valve.
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Because 335's have dual exhausts... During warmup one exhaust is closed to aid in warming the system up faster. The 2nd one doesn't open until you WOT or something along those lines... At Idle and cruise the flap stays closed, but at WOT it opens wide open...
On a 325, it's a single exhaust system, therefore it doesn't have a flap... Imagine it having a Flap and it's closed during the warmup period, now imagine a garage, with a car running and the garage door closed... Same affect, more or less