Trinity and CT Racing give the most bang for the buck, an aftermarket exhaust is loud and I think its easy to make them louder if you wanted too. Trinity and CT Racing so far provide the best HP, but I would give Trinity the nod overall. Yoshi is expensive and the carbon fiber exhaust looks awesome but it doesn't give much power from the dynos that I have seen.
For the Raptor I hear Alien makes the best exhaust.
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