ok sorry there. The car has a 3' turbo back exhaust, forged rods and pistons, steel head gasget, garett t38 turbo, 740cc injectors, saard fuel presure reg, walbro in tank fuel pump, plazmaman intercooler w 2 3/4 inch piping, greddy series 1 intake plenum, splitfire coil packs. its all ran by vipec ecu and on bp ultimate 98 octane. the thought im having is that the standard exhaust manifold is restricting flow but i have been told cars will make 500 with the standard