It's crap LOL! The engine intake dynamics are a little more complicated then that but hell if you "feel" a difference it's worth it. I used to swear by "duralube" when i was younger. If you want your truck to run better just keep the thing tuned up and run synthetic fluids in the engine, tranny and differential, AMS is a good brand to go for. K&N filter is a must, Fresh plugs, clean the throttle bodies annually. You will be shocked how much better it will run. I also like to periodically reset the ECU.