Porting Lower Intake?

[FastGT02]

Ive got a friend who is a machinist and makes his living porting and polishing heads and intakes. I was wondering if it would even be worth while to have him port/polish the upper and lower stock intake manifolds for our 99+ cars? How much hp/torque can i expect from a job like this?

 

[Jackie Chan]

dont think i would try porting a composite intake.......

 

[Will Smith]

dito

 

[1low03gt]

Can you port the lower intake,i know i can't with mine,being plastic/composite and all.
Now maybe the upper plenum is another story!

 

[FastGT02]

Im a moron, i wasnt thinking about the lower intake. However do you think porting a stock upper would be beneficial over a C&L or other aftermarket upper. Will an extensive port job outflow aftermarket?

 

[RoadconeTuning]

ported and aftermarket will be about the same... im using a spare plenum rihgt now to learn how to port stuff... ill see if it just screws up stuff or not

 

[DropTopPony]

Im a moron, i wasnt thinking about the lower intake. However do you think porting a stock upper would be beneficial over a C&L or other aftermarket upper. Will an extensive port job outflow aftermarket?

porting the stock plenum and using a intake spacer was popular before the aftermarket plenums came out but its easier to just buy a C&L or Trick Flow for $100...none of them get you more then 4 or 5 hp.

 

[LaserRed01GT]

You would probably show a little bit of low to mid range performance increase by porting the stock plenum, but something like the C&L plenum will give you a little more power all the way across the curve.

You have to be carful with DIY porting though, because aftermarket plenums are designed to give as laminar a flow as possible to the lower. You just have to be careful if you are going to attempt to do your own porting to the plenum that you don't disrupt this laminar flow.