As a previous...keep it stock looking press on owner. The mod bug bites hard and often, MPS from the start would have saved a little.

where would I drill holes? on the "diaphram" that opens up?

No, on the rim just inside of where the rubber seal would sit. Go SMALL.

alright. about 3/32"?or more like 1/8th? i will be putting in the t-stat when i change my coolant/intake gasket. might as well change my thupercharger gasket too while ive got it off. Where can I get a 3.4" pulley at? i dont need a modular one, thats all ive seen on websites sofar. Also, what size belt would I need to get after the pulleys installed? thanks

1/16th or 3/32, only one hole.

You can purchase pulleys at a number of places.
Ebay
Intense-Racing.com
Pulleyboys.com
ZZPerformance.com

Make sure your intake is opened up a higher flow catalytic and you have a scan tool. Scan during the warm weather as well. I would suggest a 3.5" to ensure you don't have warm weather problems with a press on.

I second that you need a pulley puller. My husband just bought the 3.5" pulley for the gtp, and I was doing research and found pictures of where someone used a pulley for the harmonic balancer and it warped the factory pulley. So now you cant use it anymore.

There is a guy from club gp that has a pulley puller. We are going tomorrow to his house. Im not sure how much he will charge to do it for you but i can definitely ask him. lmk.