I currently have a Trans-Go (no go if you ask me) sh!t kit in my car. Now, I am not sure what level the Trans-Go sh!t kit was set at because I purchased the car with the tranny/kit already installed. Also, the person that had the tranny rebuilt had a performance chip installed as well. He told me and I verifiied that it worked great, but with just the sh!t kit there is NO performance at all with it.
Now, I have had the Baumann shift kit in my car and would never do anything else. I know of ppl that have the J-mod done and love it, but what is good about Baumann engineering they offer other things that you can upgrade your current tranny/valve body to the bigger/better 98 model that has all the supposed bells/whistles installed from the factory. Of course it costs a lil extra, but insurance well spent. Also, those of you that do not intend on performing the step yourself it will cost almost as much if you just bring them the shift kit and any other parts that you plan on replacing when you do so.