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Yep I get. So gain is mainly realized with the removal of the cat, or replacement of the OEM cat with a less restrictive one. Basically what I was getting at is there is more to it that just replacing a very short length of exhaust piping. My next question is, are our cars able to pass emissions testing with the catted DP options? I already know they won't pass without cats.
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Bake
2011 Alpine White on Black 535i M-Sport
2013 Space Gray on Fox Red M3 Vert
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