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Which Cat Back Exhaust is the best for the Is-f

39898 Views 41 Replies 18 Participants Last post by  BriggsRT
hey guys, i just recently bought the Is-f and i need help deciding on which Cat Back Exhaust system to go with...
i keep looking up diff types on youtube but im still so indecisive...
i looked up:
Royal Exhaust
Borla Axle-Back Exhaust

if anyone out there owns these exhaust systems and can give me some feed back to which one i should go with that would be greatly appreciated!!
as well as i was wondering if they all add the same more or less hp to the car or are some of the systems give out more hp then others?
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Joe Z

How do you get a cat back to toronto and how much
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