BMW 850i/Alpina B8 G14/G15/G16 Primary Pipes

Improve exhaust flow and turbo response on your 2018–2020 BMW 850i/Alpina B8 G14/G15/G16 Coupe/Convertible/Gran Coupe with Primary Pipes designed to reduce restriction directly at the turbo outlets.

These Primary Pipes function as the downpipe section, replacing the restrictive factory catalytic converters to increase exhaust flow, enhance turbo spool, and deliver a more aggressive twin-turbo V8 exhaust character. By reducing backpressure near the turbochargers, exhaust gases exit more efficiently, improving throttle response and overall engine performance. The 850i and Alpina B8 models use the 4.4-liter twin-turbo N63 V8, making downpipe upgrades one of the most effective ways to increase exhaust efficiency and power potential.

Available in two configurations:

Race Pipes – Cat Delete – Maximum exhaust flow with no catalytic restriction, delivering faster turbo response and a louder, more aggressive exhaust tone.

Street Pipes – High Flow Catalytic – Equipped with performance high-flow catalytic cores to improve exhaust flow while maintaining a more street-oriented balance. Street Pipes are available in 100 cell, 200 cell, or 300 cell options.

Constructed using TIG welded joints and mandrel-bent tubing, these pipes ensure smooth exhaust flow, precise fitment, and long-term durability under high heat and load.

Designed as a direct bolt-on upgrade using factory mounting points, this setup installs without cutting or welding and integrates seamlessly with stock or aftermarket exhaust components.