First let me tell you the mods: 98 gtp w/ 05 l32 longblock,stock heads(w/ short sides cleaned up)comp cam 210/220 .531"/.531 115 lsa,130# crows,comp pushrods,ls7 lifters,stock rockers,fully ported gen3 and lim,stock tb,FWI,pacesetters,catless 3in back to stock mufflers w/cutout,Short stack...