i have a diablo predator progamer for a 98-04 mustang gt. if you are looking for a way to get the most out of a stock mustang this is a step in the right direction increased horse power and better gas mileage sounds like a win win to me retail is $429.00 i will take $275.00 OBO. email me @ WhoaD4u@aim.com if your interested will only be on here for a day or two before it hits ebay.