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      01-19-2012, 03:48 AM   #9
Z4MGermany
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Germany
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Drives: Z4M
Join Date: Jan 2012
Location: Berlin

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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 :-)
Appreciate 0