Wrong! I have dyno data showing massive torque gains with a cutout on my bolt on NA sr20. matter of fact I saw a gain of 10wtq at 3500rpm with open cut vs closed. My setup was gen 6 header with 3" high flow cat and catback with the cutout right before the muffler. I had a 2000 maxima muffler so the car would be quiet when it was closed.
http://www.sr20forum.com/general-sr20/134869-new-dyno-results.html
Originally Posted by classicaddict 
Exhaust has nothing to do with back pressure and everything to do with velocity. On a turbo engine everything after the turbo is some what of a moot point. But on NA the exhaust size and length has everything to do with cyl scavenging and proper flow rates. A cut out on an NA engine will do nothing but hurt performance. Case closed.
http://www.sr20forum.com/general-sr20/134869-new-dyno-results.html
Originally Posted by classicaddict Exhaust has nothing to do with back pressure and everything to do with velocity. On a turbo engine everything after the turbo is some what of a moot point. But on NA the exhaust size and length has everything to do with cyl scavenging and proper flow rates. A cut out on an NA engine will do nothing but hurt performance. Case closed.
Last edited by Nismo87SE
on 2012-04-03
at 03-19-23.
Reason: Adding proof
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