RXMmazdaspeed
Member
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- 2007 Mazdaspeed 3
is it worth getting a catless system and having to put the stock system back on for inspection? i mean performance wise i'm sure its great, but i'm just wondering if its worth it. and what is the legality of cats, do they require you to have at least one on a car, and would they know if its hi flow? sorry newb with the laws here.