I'm of the opinion that FI headers will make anything sound better than it already does, but I prefer loud in-your-face exhaust notes. You're going to have hiss anytime you open up the exhaust all the way like that, can't get away from it. I don't really know about rasp, but I wouldn't be surprised if there wasn't at least some drone.
My advice would be to call Tony at FI and see what he says, tell him Huck sent you lol.
Zdayz 2014!!
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