Well, think about it ...any thing that installs easy and doesnt screw up performance normally , will sell very good with some reckless claims about performance increases. this has been true forever..... now lets ask how it works; does it do anything?Does it change airflow? does it alter the intake pulse to the intake runners significantly? Why hasn't the manufacturer incorporated it into the basic design?If every bolt on and toot& whistle, available for my car made the HP that the vendor claims the stupid thang would be putting out so much power that i would have to install a parachute on the back, go figure... In this case all youre doing is moveing the T/B a small amount farther away from the manifold intake/ gooseneck there is no real advantage in this ..... changeing intake runner size, length and shape can and does affect Hp/tq, but thats a pretty complicated area and you can usually get one only at the expense of the other unless you can enhance total flow significantly... changeing intake plenum size can affect power, but thats a pretty technical area too..... I think that the t/b spacer evolved from the 5.0 getting xtra power from a phenolic spacer between upper and lower intakes having the effect of keeping the upper isolated and cooler therefore not heating intake charge air as much.., in the case of a t/b spacer, there is no appreciable advantage, and I cant for the life of me see any physics or other weird science that would make this advantageous........It will probably fit,heck we can make almost anything fit, but why?