HFC with a catback
Cat-back w/ stock cat will be louder.
If the cat-back your using has resonators and/or a baffled mufller, the noise would be less, compared to one w/ no resonators and a straight through design muffler.
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If the cat-back your using has resonators and/or a baffled mufller, the noise would be less, compared to one w/ no resonators and a straight through design muffler.
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