it depends on where you wanna be hp-wise. i dont think a car is peppy unless it has around 200hp(my opinion) if you wanna be peppy your gonna have to abandon the whole "pretty much stock" thing especially with an auto (believe me i have one too) i guess there is an order of quickness: slow, peppy, fast, monstrous lol. but definitely having an auto is a big wall to overcome i heard they rob your car of about 22% of its hp to the wheels.(whp) since you havent done anything to your car yet, you may wanna think about selling it and getting the manual since a swap will cost you around $2,000