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887 Posts
Catback is just overall an appearance (noise) mod. The $$:HP ratio is just not worth it to squeeze out 1-5 HP at a cost of $500-$1500. If you are looking for huge gain, and yet want to keep it to just reflash, look into header and depending on where you live, you should go for test pipe if there's no annual inspection or CARB test in your state. a $300-$400 header+custom test pipe (PLM) easily generate 10-20 HP.
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