I like how they helped the initial get up but fades threw the gears. By fourth I don't notice anything. Sure would like to see something else come out for the top end. Don't get me wrong, I'm glad I have them installed in my truck. Any help is better than nothing. I've changed exhaust, the gears, air filter system, computer upgrades and this motor needs to be discontinued and get something in these tacomas that will give other trucks a run for their money. Not impressed with the supercharger. ...