I just bought a 2006 pontiac GTO. I want to add at least 200 to 300 has to it without changing too much from the car.What would you recommend?

Add 200 to 300 HP to a Pontiac GTO??? The only way to do that would be add a supercharger or turbo charger and nitrous oxide. This would be very expensive and reliability would be a big problem. My advise>>>>> Trade it in on a Corvette or Shelby Mustang.

2006 GTO 6.0 Keep it simple just add a supercharger Pick the manufacture you like! gain 200hp don't go for more $6000 will cover the cost. Regards

Dudes,thank u sooo much..very helpful..

I agree with Auto_Centric, just add a SC and enjoy. You may also need to beef up the drive shaft, they are a little weak in these cars. The SC will give you more than enough extra power...any more won't be able to hook up anyways. Good luck.