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      04-05-2010, 04:57 PM   #39
Mike@N54Tuning.com
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Drives: 2007 335i, 2015 M3
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Quote:
Originally Posted by shiv@vishnu View Post
Reasonably well it seems. I haven't done any controlled testing of it though. The only reason I know how bad the 135 single exhaust system is was from back in the day when we tuned our first one. Up top, It was 20-30whp down from all the 135s we tested with the same mods/tune. Made sense once I looked under the car.
I think the 135i catback gets a bad rap. Here is a dyno test a few weeks ago through the stock midcats/135i catback. Not even a golf-tee mod. 91 octane + M10.

Mike
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