JPop

I agree, there isn't anyway that those numbers would stand up. They also miss the important portion of what enhances the driving experience with low rpm torque. Everyone wants to tout there peak gains and often use dyno results which don't tell the whole story. From what I've seen on this forum alone, stock dyno runs at the rear wheel vary by 30hp or more. This furthers my positions that dynos are a useful tuning tool, but the different dynos produce different results as do the different conditions at the time of the test.

On a port injected motor a throttle body spacer is going to have minimal performance increases. They don't increase fuel atomization as they would on a TB injected motor leaving their biggest benefit to be had at very low rpm, when the throttle blade is barely open. What this brings is more air movement through the manifold at low rpm but any benefit is quickly displaced as the need for air increases and the throttle blade is open further. In the end, what you get from a throttle body is some better low end throttle response, but after 1500 rpm game over.

I do have a TBS for my JK as it was part of a promotion when I bought my CAI at a Summit Racing event, Truckfest I believe. I've had it on and off 3 or 4 times and the only difference I can tell is that the throttle becomes a little touchy on roll out. Once you're rolling and going through the gears nothing that I can make note of. I guess if someone wanted to do a test with and without it, the best way to do it would be to record the manifold pressure and throttle position at cruise speeds.