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Old 03-12-2009, 05:55 AM   #33
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Join Date: Dec 2003
Location: Wichita
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My Ride: 2011 E90 M3
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Originally Posted by kraimer View Post
would adding catalytic converters such as:
get rid of rasp?
No, I have tecknik headers, OEM exhaust and the cats above welded in place of the first resonators.

Rasp? I definitely have it. I kind of like it though. My car sounds deep down low and then you'll hear the rasp when I get on it until about 5k RPMs. After that, I just hear the beautiful whine of the twinscrew compressor.

I added the cats before I installed the headers. There was no change in the tone at all with the cats. The headers really increased the volume.

I like my headers/OEM exhaust setup.
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