I got extremely lucky and got a new Borla exhaust for my '00V6 on here at an amazing price. It came with a Borla air filter but I kept my K&N installed. I don't believe it has any more power, but it is much smoother and seems to breathe a lot better. The exhaust note is nice, not loud but it let's you know when you're on the gas. I love it!
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00 Xterra SE V6
07 Civic EX
87 Fiero GT...work in progress