E370 is an exhaust. So with that, the only option to run long tubes and some sort of cat would be the XYZ Y pipe with HFC, but that will only work if your Stillen Y pipe is the same size as the stock one. It will run about $550 for the Y pipe and HFC.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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