Funny, I've got the Stillen CBE installed and I'm waiting on the HFC's to come in the mail.
Have you watched any of the videos online of this setup? There seems to be almost zero rasp at all from what I can tell.
One thing though - When I first got the catback installed, there was a rattle coming from the deadeners attached to it that could have been mistaken for rasp. I went and bent it back off of the pipe and that got rid of it.
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