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just a muffler isnt goin to much of anything...a straight-thru might up the hp a tiny tiny bit but nothing noticable...so...just remove the muffler (I did that while I waited on a new cat when I was doing my exhaust and I already removed the muffler and decided to hell w/ it)
and yes the k&n filter is gonna give you some more power over stock style filters...not a lot...but some
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