I am rather confident that the OEM exhaust past the Y-pipe will net 500whp with this kit. The rear muffler on these cars flows rather well to be honest. There is a guy with a G35 that is fully built making 800whp using the rear muffler from a 370Z. It is important to note that he did run dual 3" pipes in to the OEM muffler, and not the OEM 2.125" dual pipes.
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