Every new internal combustion car and truck sold in America today is equipped with a four-stroke engine, as are the vast ...

No car enthusiast wants a poor-performing, quiet exhaust. This is the single best mod to improve both in one go.

The Alpha Otto Rev Force features forced induction, rotary exhaust valves and can run on a variety of different fuels.

Upgrading your rocker arms can be a pretty significant undertaking for the DIY mechanic, so are the performance improvements ...

This is the first 924 in which speed is of the essence, and that's just the boost this car needed. Sports cars are expect­ed ...