Anyone know what size pully a stock 04 GTP has on it ?![]()
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Read up. You'll find a lot. Just make the pulley drop one of your last mods.
there are no chips. the best tune you can have is one custom to your car from either a dyno or someone sitting in your passenger seat with a tuner scanning and tweaking.
otherwise headers are a great choice.
Get headers...get a T-Stat, colder plugs, a PCM Tune/Dyno Tune...then you might be able to drop to a 3.4" but I'd say a 3.5"
Just a FYI...overkills are mods specific and a bit more pricey IIRC...not sure...you can get a DHP from 3800performance.com
OR
An Intense PCM from Intense-Racing.com
DHP FTW.
That is all.
Thermostat.
Get a colder one. 180* or 160*
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