The problem lies in the non-resonated x/mid-pipe. Either find you a Nismo mid-section or get you a new cat-back exhaust. Getting a new axle back muffler section will not change anything other than possibly making it louder and even more annoying.
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2012 GM 370Z Touring/Sport- Swift Spec-R, 20mm spacers, K&N Typoons, Z1 HFC's, Invidia Gemini, Kinetix camber, SPC toe, UpRev 310WHP/256TQ
2004 RYP S2000- Enkei RPF1's(blK)w/Dunlop Star Specs, Swift Spec-R, I/H/HFC
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