Whether basic bolt-ons or forced-induction, gearheads can’t help but modify their rides. With the rise of handheld and PC-based ECU tuners, folks have an easier time than ever making big power from ...

Little black boxes. Little black boxes lying to each other and to the ECU, tricking the system into thinking everything's OK and you need a little less timing or a lot more fuel. This approach of ...

Duvernay has the highest stock output production Quad 4: the 190-hp 1991 to 1992 RPO W41. The 1993 W41 lost 10 hp due to smaller exhaust ports. Photo: Kevin Davis via Wikipedia (CC-3.0) A 1992 ...

There's an old saying in engine tuning that when adjusting the mixture of your engine you can be too rich a bunch of times, but only too lean once. With that in mind, determining the air-fuel ratio ...

If you want to coax more power out of your car’s engine, a turbocharger is a great way to go about it. Taking waste energy from the exhaust and using it to cram more air into the engine, they’re one ...

There's a lot of myth and folklore out there for those seeking additional power from classic Mustangs. Stroker kits, superchargers, bigger carburetors, hot ignitions, high-flow exhaust systems, less ...