kcowden

iTrader: (2)

Anyone have any experience in smooth boring an thier plenum? What kind of Hp gian, how hard, is it really worth it? Thanks to all for the info.

kcowden

iTrader: (2)

Come on guy's..... someone has to know something about this???? I saw a picture of the inside of our plenums and they look as rough on the inside as the outside.

Lumbee1

I have thought about sending off my Injen intake and Intake Manifold for this.
http://www.extrudehone.com/afmpro.html

kcowden

iTrader: (2)

WOW!!!! $400.00 bucks. 2-3 weeks for delivery also. Do you have any idea how much HP you can get? I'll have to save up for this one. Thanks.

firebirdss

I had That done on my 5.0 mustang cobra intake picked up about 11 hp and 9 ft pounds of torque at the wheels but I have heard of even better results, might need to bump the timing a bit though the 5.0 gained another 10 hp by going 2 degrees higher then before the intake honing, if raised before the intake honing it didn’t make any more power the base timing of 14 degrees.