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All I can say is that I have the SRT Design, and it has the 350 HP exhaust suitcase, and regular resonators... I pulled off the resonators, thinking this would help. The sound was way too loud, and major annoying inside. I found out that the 350HP exhaust has more freeflow, and I also found out that I lost some low end torque. You could definetly tell the difference. I went back to the resonators, and I got my torque back. I have heard that you really have to tune the exhaust to these engines. They like their back pressure, and cross flow, so if you decide to start gutting out the exhaust, I would recomend being careful, and go with proven set ups.
I will give you a tip if your looking for good input. Last months HotRod magazine had a great MOD article on the 5.7 Engine. They took a stock Magnum and added 65 HP !!! They simply put on High Flow cats, and exhaust system, Headers, I think a CAI, and a computer tune, and waalaa.... This was a tuned set up with professionals... I would try that set up, although they used all Mopar parts. Hope this helps.
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MAXGAS1
"My favorite owned cars"
08 300C SRT Design 
95 Mitsu 3000GT VR4
69 Mustang Mach1 428 SCJ 
"My Mods to the 300C SRTD"
Billet Oil Catch Can
Intake Silencer Removal
Painted Calipers
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