I get pulled over for exhaust at least once a month now.. it's ridiculous.. got pulled on my lunch break the other day. Anyway.. as long as your exhaust is 'like original' meaning, you car came with a cat, and muffler, and you have a cat and muffler, you're in the clear. If you have a car like mine that has no muffler and put bigger, freeer pipes on it, you're STILL in the clear because it's LIKE ORIGINAL. and that's all that matters in court! (I'm still running stock pipes btw)