MPH has the exclusivity to the huge Kenne Bell 2.8H for the 99-04 Mustang GT's. We made 919rwhp on our shop 2 valve and have run 9's in full street trim with the car detuned to 680rwhp. We have installed this kit on multiple 2 valves and the results were a minimum of 700rwhp. This kit must be installed @ MPH and requires a cowl hood. Our price on the kit only includes the Kenne bell 2.8H.