Our stage 4 package includes a custom tuned flash rated at 640Hp on pump gas and 680HP on 100 octane race gas. We offer custom race gas files as well as brake boosting along with Launch control upon request. This kit includes our 63.5mm billet VTG compressor wheels( good core required), our X design 2 muffler sport exhaust with 200 cell cats, and 4.5″ Race intercoolers. Optional matching 2.5″ competition Y-pipe is strongly recommended.