Thread: Steps in modding my 2000 gtp

Originally Posted by Harleym2009

Ok, what I have is 2000 gtp, with wizard cai and straight pipe exhaust with u bend deleted. I have purchased colder plugs and 180 stat to put in. I also have a 3.25 pulley that I need to put on. What I need to know (cause I'm a noob) is what other mods are needed and in what order please. In trying to get to at least 300whp. Thanks for any help

Thats the wrong word to use.

Read the modding thread in the supercharged section/general tech section.

yeah you are going to need alot more mods to run a 3.25. try e85, intercooler, cam, headers

^ You don't need all that to run a 3.25. You will NEED flow mods to run it safely though.


Headers or a PLOG/downpipe combo (headers are better)

Cam or rockers would be the next best thing to improve flow. Check around for which you'd rather do (cam will have more affect on the car and more possible power output, but rockers are easier to install)

And/or a fullsize intercooler. Skip the short stack IC, no reason not to go fullsize. This is one of the best ways to combat knock and to drop pulley sizes.

E85 is a great fuel to use to get more power, and to kill knock. Depends if you have easy access to E85, but will require larger injectors and a fuel pump upgrade/rewire

A tune. To be running anything smaller than a 3.8 pulley you really should get a tune. Mail order tunes are okay as a baseline, but getting an in-car tune is the way to go.

If I were to take a stock GTP and make it run a 3.25 pulley I would get/do:

Speed Daddy headers
Ported Gen III
Cam-your personal choice w/ supporting mods (valve springs, retainers, timing chain/dampener, etc)
60# injectors (while not needed, it will allow for more headroom with tuning and further upgradeability)
Open cone intake
Custom tune.

Originally Posted by Harleym2009

Anyone have any info on porting the supercharger? I guess I'll have to match it to intake and get larger throttle body also. Anyone got a how to on this? I guess this will be my next step... Thanks

Search porting the supercharger, we arent going to spoon feed you this info.

You can't open it up to size of the intake, because it's not "built" that way. Once you search and see the underside of th blower, you'll see why.

And upgrading to a larger throttle is not needed, you will not outflow the MAF or the throttle body with 250-300 horsepower.

You need to base pulley size based on what is done to the motor, not the other way around.