Just got my car back after having the Griggs GR40TT installed and setup. I also installed a TR 6060 6 speed tranny and Griggs built rear end with Wilwood brakes. If anyone lives on the East coast and is looking for someone to work on their Saleen or any Mustang in general, Don at Mustang Don's Garage in Richmond, VA is a must see!! Don is one of the most tedious and knowledgeable mechanics I've ever dealt with and I will be using him for all my future upgrades. When you bring your car to Don he sets up a photo album on his Facebook page (Mustang Don's Garage) and up loads photos daily documenting the work that was performed that day. It was truly the best experience I've ever had away from my baby.
Check out his page for other mustangs he has worked on, it's impressive.