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Quote:  Quote by : OAC_Sparky

Generally throttle body spacers on an injected engine are useless.

The purpose of spacers on a carbureted car serve to change the airflow and give more time for the fuel to mix with air more uniformly.

Since our engines inject the fuel into the intake runners directly before the head, you could add a 20" spacer and it would not change anything, except usually add turbulence to the airflow system, which makes it worse, not better.

Unless you're using the spacer as a port for nitrous (and to be honest, I haven't looked at a spray setup on our cars and don't know if that's where it's injected into the system (it is in a carbureted car)), I would say you're wasting money.