I made 304whp on a mustang dyno with just test pipes exhaust and drop-in filters, then I put the rest of the mods on and got the tune/ on a different dyno so the results really cant be compaired but I made 268whp at Project X on a Dyno Dynamics which reads about 10-15% lower than a mustang dyno... but peak HP is not a big concern to me I wanted more of a midrange
DAN