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yes, overall u'll have more power w/ a cat-back exhaust, u'll definitely notice it in higher rpm's. but sometimes having too big piping for an n/a won't exactly optimize ur performance, u'd be letting out 2 much air or exhaust. if u get an aftermarket intake like injen, u'll be taking in more air, then u'll need to get that air out efficiently, hence the cat-back exhausts. unfortunately most bolt-ons will take away some low-end, but the overall performance will be better, it's not like ur going to lose ALL of that low-end torque u like.
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