High flow cats or test pipes. Your stock cats might just be damaged/falling apart from the added load from the SC. Not sure if just adding something will solve it.
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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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