Gt500 Throttle Body Upgrade

Throttle bodies really don't show any improvement.

Not unless you got a blower attached to it.

I have gt-500 and plate on my car and it fir perfectly and before the tune it made a difference in higher RPM's

No it will not, the plate is required because the bores of the stock intake manifold are for 55mm throttle plates, the 60's from the GT500 unit will not open fully without an spacer plate.

I designed my own adapter plate. Its made out of aluminum but is only 3/16 inch thick, not 1/2 inch thick like the BBK adapter. My car has a decorator cover over the manifold and if you use the 1/2 inch plate you have to toss the cover which is $90 in value, I wanted to keep that cover so I did my own measuring and found I could make an adapter plate that would allow the butterflies of the throttle body to open fully and keep my manifold cover as well. I have had mine on my car now for over a year without any issues. I also will say the GT500 throttle body is the best way to go, its a plug and play, it works with the current computer on board, and there is no adjustments to be made, except to have a new tune for the new throttle body. I read somewhere someone said that you do not get any gains from a throttle body, well that might be true when your engine is in the stock tune, but you get a race tune and that throttle body lets the gorilla out...not to mention with a CAI combination it really wakes the engine up...