Throttle Body Spacer?
At WOT the ram length also includes the snorkel between the TB and the air filter box is the dominant consideration, far as ram effect goes. Installing a plate to extend the length less than several inches is going to have NO measurable affect, except to lighten your wallet.
Like someone said, open up the hole in the air filter lid, or if ya wanna spend a little bit o cash, remove the front license plate and install a ram air duct.
But, truth is where you find it. So, for about $100 a pop, you can do a "before and after" pull on a dyno and get back to us. Just be sure the temperature of the engine is the same in both trials. Then you'll be much more of an expert than most that actually install one of those gimmicks.
Next up: Gotta install the "Tornado"
!!Put your money on a professional tune before cluttering up your engine with a buncha "miracle" bolt-on wonders (that would have been on there from the factory, if they really worked!)

P.
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