Hey Bud, congrats on the new Goat. I had 2 of them. I never had an 05 or 06, so yours looks a lot cooler than mine did. Mine was kind of bland. A couple of sites for you to check out.. ls1gto.com newagegto.com and gtoforum.com One of the complaints with the autos was the torque management system, so you may want to look into getting a tune. With headers and a tune, along with an airbox and you could probably pull 360 or more to the tire. Thats my best guess, I haven't been on the gto board in a while. Been too busy hanging out in here. The ls1 with the six speed is the only part I miss about my GTO. Now if they made a mustang with an ls1 and a 6spd, that would be one badass ride. Good luck with your new ride.