I changed only the resonated pipe and back box and that released alot more of the flat 4 noise, but I think I will soon be replacing the 2nd cat pipe as that also seems to make a difference. I am currently running an afterburner vortex back box which is great, but thinking of changing it shortly for a blitz nur spec 
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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