So I need some help. I want to install a twin turbo on my 4.6 mustang and I need know if there is a certain type of turbo I HAVE to get. I know they make the T3 and T4 for the mustang but I'm wondering if I have to get that exact one. Basically if there if its like a supercharger where you do need the exact model for your year and car type or it won't fit correctly. In addition how long will it take/cost to install (not to purchase though)?