A turbocharger is the best power-adder by far. Not only do turbos harness otherwise wasted exhaust energy to drive the compressor, their modular nature lets compressor and turbine housings and wheels ...

A 640 horsepower Audi SUV faces the hybrid Porsche 911 Turbo S in a clash of luxury performance and pure speed.

Perhaps overshadowed by the bowtie boys, the modern Hemi suffers only from a PR problem, as they offer every bit as much performance as their GM counterparts. Like the LS, both the 5.7L and 6.1L were ...

Back in the last episode, we gained 50 rwhp by swapping to high-flow ported heads (Jose Motor Sports) and a hydraulic roller cam (Comp Cams). Our power gains were quite impressive considering there ...