l was wondering either a supercharged or twin turbos. What will be the best thing for it?

twin turbo or just chip it and put on an exhaust

Stop being a nap and go over to LS1Tech.com and start doing some reading.

Quick overview .

Long tube Headers, Full Exhaust
Intake Manifold
Rear suspension components
Race tyre

Those are pretty much the most basic necessities.

You can talk about TTs and S/Cs after those are done . and you have 20k sitting in the bank .

Twin turbo send picture when you do it to it

Why twin? Just go with quads.

4 more makes power than 2..

Ok, sarcasm over. Go over to LS1Tech like the first response said, plenty of good info over there.

ls1gto.com would be the GTO specific forum. My opinion is that the turbos r a much better option. Due to the limited amount of room for rubber in the back, u can get off the line with the turbos with less issue where as with the supercharger u r making boost immediately, thus making it harder to launch. As far as drive-ability, depending on the setup each one can be relatively transparent when talking normal driving. Anyway, some other options r heads/cam & nitrous. l would say check out ls1gto.com & u will get more ideas than u ever thought was possible.