I have your set up - I ran non resonated TP's and I did it for one day only.
I have ran resonated TP's and it was better but there was still rasp.
The only time I have never had some sort of raspy tinny fart was with the following.
TP's with Invidia Gemini
ART pipes with stock exhaust
HFC with stock exhuast
Stock cats with surewin and TSCBE
If I were you I would get some ART pipes
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Boosted V8 hunter
2850 lbs and 375WHP
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