New mod for 97 cobra?

Ok, I have flowmaster exhaust, hooker lt headers with hooker offroad pipe, 4.10 rear and need some help. I am looking to do one more "performance mod" as well as something for suspension. I do not want to spend more than like 800$ total on both. What should i do? I have a lot of problem with tire spin and do not want to get slicks thats what made me decide on one perf and one suspension. Help plz!

The headers are nice and perform well; however, i have an issue or so with them... 1. I also purchased the offroad x pipe to go with them, it is a mofo... just the design.. too much to explain just trust me.. lol.. as well as the labor ran me almost over a grand to do because a lot of stuff was difficult on them, ie stuff not lining up and that nature. My mechanic chopped some of the labor because we didnt expect that. He said they are nice headers but to not recommend them to anyone because of the difficulty in applying them.