Dave,

Below is the forum link and where I bought mine. Of course I save a little money and built mine my self. But you can buy premade kits. I have the MSIII and Have a config that can get you started. I have a Modular Pulley setup and have tunes for each pulley I use, currently have the 3in on there but I haven't been driving it this summer. Still doing Tranny swap and Body work next. If you get an MS setup I can help you get it wired and running.

Forum = http://www.msextra.com/

Place I bought mine = http://www.diyautotune.com