Throttle body spacers.... they are considered paperweights by the people who do custom tuning because they do nothing. IF it works at all it would be with an intake. Think about it. The air would have to be coming in smoothly to be circulated. Stock tubing, the air is bouncing off the flex tubed intake. Also look how deep the threading is on a TBS to supposedly circulate the air....you think air going thru that fast is going to be affected by a 1/16 inch groove going the opposite direction? I would want to see a wind tunnel test proving the air gets mmanipulated. Also with the throttle response being better...i know on fords the throttle response can only be changed with a tune. I'm guessing all modern vehicles are that way now. It's the butt dyno that is being felt.

 

I'm not saying throttlebody spacer is Work. I'm just wondering in your argument you say car manufacturer spend millions giving you the most horsepower possible out of an engine, yet you can add horse power from things like better exhaust, bigger throttlebody, camshaft, roller rockers and a tune