SRT-4's are very responsive to mods. There are a lot of independent shops putting out mods for them and now the bigger companies are starting to come out with stuff. The mods are very well priced. I love mine. The only two problems that I have come across so fare are:
1) Wheel hop is a pita
2) It's not all that fun to drive when it's cold until it's had about 15 miles of warm up time. Then it's good to go.