Please don't take this as critical, I appreciate any time anybody is willing to do something to help our platform advance. What is it this spacer is supposed to do to increase the performance? From what I read, it's claim to fame is that it swirls the air all the way into the combustion chamber. I can't say that won't work in a naturally aspirated engine, who knows, it might. The swirling effect could increase flow dynamics. I'm very certain though that it will have no effect for anyone with a supercharger. It certainly won't swirl the air to the combustion chamber with the sc, the turbines are just after the throttle body. Any resistance to air flow that the spacer might overcome is already being taken care of by those turbines sucking air in and the turbines make their own air flow.
I think this is another "grounding wire" application. Yes, there are some cars that adding grounding wires will increase performance. That is because of poor engineering of the ground circuits by the manufacturers originally. The same goes for this if you would consider it for a NA engine. If the intake air flow was poorly designed originally, accessories like this and other "exhaust swirlers"

could help make up for their defficiency. Do you think Toyota messed up?
In short I can't believe it could do anything for a sc'd engine and if you think Toyota messed up on intake airflow for a NA engine and dyno numbers prove something, give it a try. Remember though dynos CAN and DO lie. You mileage may differ... -JoeB