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      06-25-2008, 10:50 PM   #19
Major General

lucid's Avatar
Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

Posts: 8,034
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So, the M engineers got this all wrong then. They don't know how to design efficient headers, but some aftermarket guys do? Like Swamp is saying, I'll believe it when I see evidence. Sure, you can mess with the cats, but as Greg is pointing out, do you want your car to pollute 100x more for a little bit more power?