Noticed a definite increase in torque, especially in the low end. My gas mileage has increased by 2 MPG as well, even while being heavy on the throttle. I'm in the process of checking the mileage while taking it easy. Installation for my car took longer than expected. Some bolts are in a hard to reach spot, and unscrewing the studs to use the bolts in the kit took some time, but I find it all worth it. Excellent product, I definitely recommend it.