Primary and Secondary Downpipes F90 M5 / F9X M8 S63TU4

The HUKSN Primary and Secondary Downpipes are the ultimate performance upgrade for your BMW F90 M5 and F9X M8.

Designed to unlock the full potential of the S63 twin-turbo V8 engine, these downpipes deliver increased power and torque across the entire RPM range.

By replacing the restrictive factory components, they improve exhaust flow, resulting in faster turbo spool, sharper throttle response, and reduced under-hood temperatures. Improved thermal management also helps extend turbocharger lifespan while enhancing overall engine efficiency.

Constructed from premium 1.6mm-wall T304 stainless steel, the downpipes are mandrel-bent for maximum flow and feature smooth, non-restrictive transitions to minimize turbulence. Each unit is fully TIG-welded and back-purged to ensure strength, durability, and long-term reliability. OEM-spec V-band flanges, along with factory-style brackets and mounts, guarantee precise fitment and a true bolt-on installation.

In addition to performance gains, these downpipes deliver a deeper, more aggressive exhaust tone that transforms the driving experience without compromising quality or fitment.

Installation is straightforward and requires no cutting or welding. The downpipes bolt directly to the factory exhaust system and include all necessary hardware for a hassle-free install.

If you’re ready to take your BMW to the next level, the HUKSN Primary and Secondary Downpipes offer uncompromising performance, OEM-level fitment, and premium build quality—engineered for both street and track use.