had mine to 155 and still had some ways to go. seen some people say they got them to 164. havent had the chance to push it that hard.
while the agp wastegate is one of the best and cheapest mods, (you can get a used one for under $100) def get a turbo timer first. i hated the car till i got a turbo timer.
i love the car and will keep mine long after its paid off and cracking 9's. a few small mods and you got a really great ride. while there are some better "daily drivers" for less money, not with the get up and go that you will get with the srt4
dont get an 03 and for god sakes, dont get a RED one