[SVT-WGN]

I am skeptical, no very skeptical, that a throttle-body spacer would do much. Back in the old days, maybe, when an insulator allowed the carburetor to be a little cooler, it may have had a tiny effect. With today's fuel injection injecting fuel right near the valve, the only benefit I can see is more money for the seller.

Install a K&N cold air kit and a less restrictive exhaust (like Borla). Then you will notice a little more power gain not to mention a nice little roar when you step on the gas.

However, if you are really convinced by these anecdotal sales references, why not build your own (just kidding - not everyone has access to milling machines.)