Does anyone have anything new on getting extra ponies for the 2004 GXP. Anything new on chips etc.
Let me know.
Thx AndyW

there is nothing, and its sad to say there prolly wont be either

Andy, there has been alot of discussion on this very thing.

Read the two sticky topics at the top of this section.

Wow! another N* owner to talk to.
Andy theres a couple things you CAN do.(not much but..) Start with swapping out your OEM Air filter (probably dirty by now) with a K&N filter # 33-2063, might have to ask for it by part number/ most parts catologs dont list it for GXP.

When you add fiter you'll notice a tube in the first chamber/ gut it. Have someone rebore your Throttle body to 80mm. Theres a machine shop listed in this section and others.. I've researched extensively and not much else can be done unlees your want to rip out your near new exhaust system.

I am nitrousing mine,....but ran into a brick wall with the Holley/NOS setup after they said it would work.....and didnt.(But they did let me return it after half of it was already on car. Now have a ZEX nitrous kit on the way and it looks like a shoe-in, ZEX #82023 (even has an adapter to screw into fuel rail)

I was going to gut my airbox but the Nitrous / gas jet must be 6" in front of TB so I'm removing the airbox entirely and going with a 9" chrome tube between the TB and a cone filter which will set at far right behind drivers fender well. I will post pics when it'* all done. T he kit I mentioned can give you 75-150 Hp boost for $600 and some change and you can go postal with a rejet kit for 150Hp-250Hp.....but I think the engine would fold up at that kinda boost.

The great thing with nitrous is it is passes undetected though the system and wont need a PCM reflash which cant be done on our engine. Also our engine has a detonation(knock) sensor in head between cylinders 1 and 3 which will retard timing if the nitrous mix starts to detonate in intake( A super big plus for a nitrous setup). Read through the FAQ'* listed at NOS and ZEX before you listen to old '70'* horror stories from people who have never used. The systems these days are a far cry from the past and the only real hope you have to make that GXP fly.