05-04-2010, 12:36 AM
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#10
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Junior Member
Join Date: May 2010
Location: Missouri
Posts: 26
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Back Pressure?
IMO, back pressure is a myth. My step dad used to race open wheel modified's and was always harpin' on me about my back pressure when I made exhaust mod's on my first vehicles, but I straight piped both my first cars, ran over 100,000 miles and never had a single valve train problem, which is the common said result of running low back pressure since the supposed loss of "back pressure" of your exhaust doesn't let the exhaust valve(s) close smoothly. Instead they sort of "slam shut", but guess what... that's what valve springs are for.
I did drop a valve in a Nissan I straight piped, but that was due to red-lining it way way way too long in a race. Anyhow, best of luck.
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