They say that an intake swap is only worth about 8 hp.
When i put a GT-40 w/ ported lower on my old GT it picked up about 1 1/2 tenths.
So it definitely helped out.
I have a cobra upper and lower both extrude honed, waiting to put them on til heads but it is beautiful...like a mirror
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com