Headers are among the most widely used pieces of speed equipment; tubular steel exhaust replacement components are found on virtually every form of performance-oriented engine. Thus headers are always ...

We installed a set of Supersprint exhaust headers on our S54 powered BMW Z3M Coupe to see how much real power they add. In this video, we walk through the install process, explain why these headers ...

Having run our header test in the last issue on the normally aspirated version of the GT1000 motor, we were anxious to retest the motor with some boost. You will remember that the 5.4L GT1000 was ...

Anyone who has lived on a healthy diet of off-road and performance magazines has gotten a pretty good taste of the dyno process, even if it's just served on the printed page. It looks pretty exciting: ...