i have a full weight 87gn.my combo is ported irons & intake stock plenum&stock throttle body with rjc power plate. 206/206 flat tappet cam.stock rocker arms.stock maf. #60injs.turbo tweak 5.7 chip precision stoc/location intercooler & 6765 ball bearing watercooled turbo.built trans with 3200l/u ptc converter.i dont have alky. at 17psi.boost at the track my best pass was 12.09/110mph.& 1.74 60ft..my tires are M/T drag radials at 18psi 295 50 16 .this is a stock suspension car on GTA rims.i dont shift the trans. i just put the trans in drive & leave at 2psi of boost. also have a reds single pump hot wired &adj.fuel press.reg...Do i need to change my plenum& throttle body over to the 70mm bigger stuff?And do i need to change my stock maf over to the bigger lt1 translater stuff? WILL i gain any performance? & at what point should i change that stuff?..Please help .