Downpipe Exhaust For BMW 3 series M3, 4 series M4 - S55 Engines | SPELAB

This 3'' turbocharger downpipe will increase exhaust flow out of the turbo, improving performance.  

What Does A Downpipe Do?

The downpipe on your turbocharged vehicle is directing the exhaust gases out of the turbine housing into the exhaust system. An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether.

By removing the factory downpipe and replacing it with a high flowing unit you are allowing the turbo to more efficiently move gases away from the turbine which creates more power. Since the factory restrictions are now gone you can increase the boost on the vehicle as the factory downpipe is a choking point for performance.

Specifications

BMW 3 Series, Type F80
M3 Sedan, 317kW
 
BMW 4 Series, - Coupe, - Convertible, Type F82, F83
M4 models, 317- 368kW