Sounds like a waste of money to me. The only thing a TB spacer does is put some space between the TB and the inside of the intake manifold, which probably does nothing. Now the air passes through the air filter, through the TB, past the spacer, into the manifold, and then into the manifold runners. There is no way you'll get anything close to 22 hp from that thing.
TB spacers have their use on carburetors, because you have fuel mixing with air right there. With EFI engines like the 5.2 and 5.9, there is no fuel even close to the TB.
Check out the Kegger mod(http://www.ramforumz.com/showthread....136#post536136
) to see what the inside of the intake manifold looks like. The spacer just sits on top and the TB on top of that. I don't see how this will do anything at all, much less give you 22 hp.