I changed from the base Y-pipe to the nismo H-pipe and there is a difference. I have muffler deletes cuz i like loud. But the H-pipe does pick up some power compared to the Y-pipe. Don't bother changing the cats, they're the same.
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PW 07 HR350Z R.I.P. Totaled by 82yr old woman 
2010 40th Anniversary 370Z
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