Quote:
Originally Posted by MJB
Hfc's don't cause hardly any rasp if any. Remember, they still have a core in them, just not as large and more free flowing than stock cats. TPs are going to give you a ton of rasp depending on exhaust you have. I'm going to wrap my TPs and add smaller resonators on my Ark exhaust to get rid of some of it.
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i had stillen hfc's and mine rasped quite a bit.......