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@ 1.5k to 2.2k rpm, and a slight rumble as rpms elevates slowly but when i hit the gas, it sounds just like when i had the old cat (didnt change the muffler....yet) but louder and more aggressive. and it's definitely got a few more hp from it
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since when does louder mean you have more horsepower?
you eather need to dyno or get some before/after 1/4 mile time to say you "got a few more horsepower"