I was talking to one of my buddy's the other day and he had a 05 Monte Carlo SS supercharged and he told me about the after market PCM's you can get or them. He told me i should get on for my stock 02 GPgt. He told me to go to ZZP.com or what ever that site is. I was just wondering would it make a big difference to where I would actually feel the difference and worth spending the money.