Does anyone know the stock PSI on a GrandPrix GTP? I've looked all over the internet and I can't find a thing about it. Mostly I'm just curious but it would be nice to know. If anyone could find out that would be great. Thanks.

7lbs is the stock boost. many peak at 7.5lbs depending on temps and elevation.

start modding it out, go with a smaller pulley and at minimum you'll jump to about 11lbs boost and can go higher.

add a good intake though so it can breath. of course you'll jump on an exhaust too.

even so, with just about $200 you can pull low 14's in the qtr real easy.

I ran 14.667 bone stock!