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Originally Posted by Z4MGermany
We have not made WOT runs as the car is factory new and nit run-in.
The reving-noise was raised from 93db to 108db with open valves.
Closed valves mean stock noise levels.
Here's some more info:
it's a 3" axle-back, it doesn't make sense to change the piping from downpipes to rear axle as it is full 3" stock and has 2 very very small mufflers.
The biggest restriction are the downpipes with 4 (2 on each side) restrictive catalsysts.
I'm getting new SS downpipes with 2 (1 on each side) 200cpi metallic cats.
No engine light, a decent hp gain and more noise is promised :-)
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Excuse my ignorance, but which of the m5 settings opens the valves to get the more interesting noise?