2000GT4.6

do exhaust before the intake stuff. lots more gains for your buck.

regardless of any of this, a t/b is almost totally worthless on anything close to a stock car. Even at full botlons I have never seen anytone pick up more than a few rwhp (2-3) with the t/b alone. Most of the gains that are had in the intake tract are in the plenum.

Dragon02GT

I think they would both beneift one anoter. THe headers will allow mor air out of your car but without more air coming in you would not really benefit as much from them. Maybe 2000GT4.6 is right and a 70mm is good for your NPI gt, but either way allowing more air in and out will help to "free up" some HP. I would think to see your best benefits a dyno tune would be in order. With advancing the timing and adjusting the A/F you could see some decent gains with intake and exhaust mods. I think a good tune is more important than the difference between a 70 and 75mm TB.

Dragon02GT

+1

kontroldkhaos

thanks guys !! it will give me something to think about...decissions decissions

Dragon02GT

by the way, if you decide to go LT's, just PM me and I can give you a whole write up that will help you step by step to put them in.

Dragon02GT

I lied, don't worry about he PM, here is the link

Long Tube Header Install

nitestalker

[2000GT4.6] but for him it will do him good for the 75mm, *** he dose not have a race car

kontroldkhaos

im definately going with the long tubes,loud and proud

Dragon02GT

Very good decision. The sound alone from the LT's was worth it IMO, but the performance is always first. You should've heard it when I first put on the LT's and ran it for a couple minutes with open headers. OMG, I had to change my pants. I can't imagine what it would've sounded like with a big cam in there. I think my reation would've been [sm=jawdrop.gif]

LvGordo

i lost a buttload of torque when i put my mid-lengths on, i got used to it but it came as a shock the first time i drove it.