TWM is the company that Roush uses for their FI. They can be purchased from a guy on this forum THOR. I use a FAST XFI and have had no problems. It is pretty easy to install. The hardest part is welding a bung on the exhaust manifold for the O2 sensor. It has a nice smooth power band that is easy to drive hard and hard to drive easy
I have a picture of the cam label in my pictures.