I'm new to the GP modding world,I have an 01 GTP, In the never ending pursuit of horsepower this is what i've done so far:
3" downpipe/high flow cat/ u-bend delete, ceramic coated powerlog and crossover, 180* t-stat, autolite 605's, cold air intake, msd wires, overkill pcm. my question is do you think it will be safe to run a 3.5 pulley with what i have done, and what kind of dyno #'s and 1/4 mile time you think i'll get with this setup? Thanks in advance.

with those you could run a 3.4 if no *kr but to be safe if you can't scan the car 3.5 mps

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I would say trial and error. You have the supporting mods for a smaller pulley, but that doesn't mean it wont knock. The only true way to find out is to scan. get a 3.5 and scan and if no Knock maybe go down to a 3.4 and scan again. Only real way to truly tell. All cars are not built equal...

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3.4, K&N Intake, SLP Power-Flo Exhaust, ZZP 1.0PCm, Front STB, Drilled 180*, AL 104's, Goodyear Eagle GT's, Special Edition Hood. OH and 0 KR courtesy of LS1M scanner.

Every car is different. When I had a 3.6 pulley on and was running 13.7s with rockers, PEMS, intake everyone kept saying why aren't you running a 3.4. Well, because I'm not going to drown the engine in fuel just to run a small pulley. I still run a 3.4 on the street with cam, headers, and e85 but I run 22* timing and a wideband AFR of 11.8-12.0:1 instead of 10.5:1 like a lot of people probably are to run a small pulley.
If I were you and if I had no way to scan, I'd go with a MPS and put a 3.6" on there just to be safe.
I'm not sure where you are located? Maybe someone in your area could help you out and scan/tune your car. The tuner I bought is absolutely the best money I've spent on this car.

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99 GT (Stock - DD) & 04 Comp G (A Few Mods)
New 1/4 mi. PB @ Pontiac Nationals 2009: 12.79

Im from CT, who makes scanners that can scan for kr and how much are they. i'd rather get a hand held scanner than the aeroforce. I didn't put the 3.5 on yet, will it be a big difference or small?

if i was u i would get AL 104s and go with 3.5 too be safe

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2001 Black GTX 2 door mods: E85 , 2.8mps , 1.9s , headers , SSIC and other supporting mods and ZZP tranny with 3.29s , ZZP 2500 stall , ect , SOLD

x2 but definatley just get an aero force scanning gauge they r worth the 200$
and do urself a favor and get a MPS it would save u A LOT of headaches

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

I was thinking of getting the aeroforce gauge but it kina eliminates the need for any other gauge, and the only sell minimum 2 gauge pod a-pillar. idk what other gauge i should get with it.

get a dual aeroforce
you can view 4 things at once

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u can stick it one of the left heat vents if u only want one gauge

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

actually 16...each gauge cycles through 8 different user selected parameters if you set them up to cycle.

i have a dual aeroforce kit and a wideband o2 and i couldnt be happier.




he has a 2001, we dont have round vents like you guys.

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6

^^ sorry my bad... then if u dont have a HUD u should have that little square hole on the right side between ur deck and stearing wheel
Thats where my brother had it is his 03 GTP

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

You have the same basic mods as I do. If you go to a 3.4, change the plugs to Autolite 104s. You know what, might as well do it anyway. I doubt you're stopping at a 3.5.

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2012 Ford Focus SE Sport
2012 MINI Cooper Clubman

I have ADHD and drive a Focus. Ironically.
Although gold dust is precious, when it gets in your eyes, it obstructs your vision.

yeah i wish its just that easy

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

I'm stuck there lol. No money for mods. I wanna turbo.

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2012 Ford Focus SE Sport
2012 MINI Cooper Clubman

I have ADHD and drive a Focus. Ironically.
Although gold dust is precious, when it gets in your eyes, it obstructs your vision.

yeah.. tell me about it.. i got raped with all those mods.. but non of them is in yet still a 3.5

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

Well, first I want rockers. Almost bought those. Then headers. But if I'm turbo I can't USE headers. This sucks royally.

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2012 Ford Focus SE Sport
2012 MINI Cooper Clubman

I have ADHD and drive a Focus. Ironically.
Although gold dust is precious, when it gets in your eyes, it obstructs your vision.

^^ no worries.. ill have a plog for sale soon

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

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01 GTP SE Sold. 89 Mustang Vert 331 T-trim

I'd consider getting the blower ported first before I started turning up the boost.

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2005 GT owner [Non S/C] with a "big DIC".
Two years later and I still love the car.
Thanks Pontiac...Bleen is keen!