Velocity stacks may not be the absolute coolest thing you can put on your car, but... actually, you know what? They are the coolest thing you can put on your car. Here's what they do, how they work ...

Nothing screams '60s-era coolness like a bunch of velocity stacks on top of some American iron. Usually, they showed up on road racing cars where a mile-long torque curve could help the wide rpm ...

How do you take something that’s already good and make it even better? Just ask aftermarket tuning manufacturer Greddy and their newest intake manifold designed for the Nissan R35 GT-R. The R35 RX ...

Gasoline engines burn a mixture of fuel and air. In order to create horsepower, your engine must maintain a good quantity and velocity of air/fuel charge into the combustion chamber. Think of the ...

We recently spent a couple of days dyno-testing several different rocker-arm ratios on our 470-inch Mopar big-block. The good news was the engine made 700 hp on pump gas, but we were disappointed when ...