Thread: Kreissieg F1 Valvetronic Exhaust System, install, pics, and vids
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      06-30-2009, 06:49 PM   #51
lucid
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Drives: E30 M3; Expedition
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Quote:
Originally Posted by Subw00er View Post
What is this horizontal piece for?

It looks like it blocks part of the flow.. is this for back pressure? tone?
Probably trial and error blocking to tune for sound?
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