So I just installed my RV6 HFPC's and j pipe on my 04 TL that already had XLR8 non resonated exhaust on it. The sound now when from great to AWESOME. The only drawback is a slight rasp, very slight as in it lasts for about half a second, in the 3500-4000 rpm range. The HFPC's are extra money for a main reason in making sure that the rasp doesn't occur, so I'm starting to think it is the RV6 j pipe. So what i need to know is what resonator gets rid of a small amount of rasp present while not affecting the amazing sound gains I got, or if all resonators do, what does it the VERY least.
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