hp
if thats the only mod so far, you probably wont noptice much of a difference, i believe exhaust usually adds about 10 hp, but i never felt any of it until i put on a 5% puller for the supercharger,,, you will lose some boost with exhaust alone, add an overdrive pulley on that sc and youll feel some good stuff, that was my experiene,, buyt doing that exhaust is necessary for any other engine mods, so you're starting in a great spot, have fun with it-
Damon