^ lol a 2v would be a 2004 down to like a 96 gt, a 3v i think is 2005 up gt, and a 4v is the cobra or mach 1 cars. I would go with some 3.73's gears because u want see a big drop in the gas miles. and with a bassani xpipe and catback. on top of that get a xcal3 for the tune and believe me it is worth it it could get u better gas and power in spots u don't currently have