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 and why everyone goes nuts over them.
Velocity stacks are the lace teddies of high-performance engines. So when Chicagoland's Fluid Motorunion wanted aluminum horns for their project BMW M3, they ran to the AutoCad and created a mockup. Then, they carved out these nasty sombitches in three dimensions.