We have a set of them to try on lens car. We will do some testing with them after we get the motor back together. What we have learned is that they do not give you any more peek power but it is the better power under the curve. We tried a simular idea with my brother car years ago and the car loved them. It helped it to the 8th but did not add any mph on top. We are looking forward to see how they work with Lens combo.