Stock 1st gen strokes, and stock 12V cummins. This is off the line and up to about 40-50mph. I have a C6 so i am limited in that respect. Pushing 10PSI is a whole other game. When i do a 7psi launch i can really lay it down. Love my C6 with shift kit but really need some more gears! lol. If ya need help going from stock to sweet, let me know what you want to do, i can definitely help.