has ne one ported their NPI heads and intake?
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Senior Member
Joined: Mar 2008
Posts: 170
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From: J-ville, FL
has ne one ported their NPI heads and intake?
Hey guys just as the subject asks.... have any of you ported and polished your NPI intake and exhaust?? what kind of gains did you see? is it worth it?
Thanks!
Thanks!
Senior Member
Joined: Oct 2009
Posts: 6,172
Likes: 1
From: Missouri
No it is not worth it. If you enlarge your intake runners, you will move your torque curve much higher loosing your low end torque. If you like having power under 2k RPM, leave your runners alone.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
I ported and polished/knifed the intake, then port matched the lower to the upper. I can't say that did anything as far as improvement, I'd like to think so, that was allot of work. I didn't dyno so I don't know. Runs damn good tho lol.
