^^ this is very good advice.
My personal opinion is to go with Fast Intentions. They are an amazing company with amazing customer service that produces an amazing exhaust that sounds amazing. Get the point?
seriously though, I would say that more than half the people on this forum would immediately tell you to go with FI. Their exhausts are the best quality, they sound SWEET (you can watch my videos to hear it) and Tony the manager is a stand up business man. You will be seriously hard pressed to find a better value.
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