Heat-shielded Primary and Secondary Downpipes F90 M5 / F9X M8 S63TU4

Engineered with a focus on performance and thermal efficiency, the integrated double-layer heat shielding effectively protects surrounding components - such as wiring, hoses, and sensitive engine bay elements - from the intense radiant heat generated by the downpipes.

This advanced thermal insulation design reduces surface temperatures by up to 70%, significantly outperforming conventional heat wraps and ceramic coatings. By minimizing heat soak and lowering under - hood temperatures, it helps improve overall engine efficiency, enhance reliability, and maintain consistent power delivery under demanding driving conditions.

Developed as a true OEM+ performance upgrade for the F90 M5 / F9X M8, these high-flow downpipes are designed to unlock the engine’s full potential. Improved exhaust flow delivers noticeable gains in horsepower and torque across the entire RPM range, along with quicker turbo response and more immediate throttle behavior - all while preserving factory level drivability.

Key Features:

• Measured increases in power and torque

• Faster turbo spool and improved throttle response

• Reduced under-hood temperatures

• Refined, deeper exhaust tone

• 100% bolt-on installation

• Fully TIG-welded and back-purged

• Premium 1.6 mm wall T304 stainless steel

• OEM-spec V-band flanges

• Factory-style brackets and mounting points

Manufactured from high-grade T304 stainless steel, these downpipes are built for long-term durability under extreme exhaust temperatures. Precision mandrel bending ensures optimal exhaust flow, while smooth, non-restrictive transitions reduce turbulence and backpressure, allowing exhaust gases to exit more efficiently.

Installation is seamless and straightforward, requiring no cutting or welding. The HUKSN F90 M5 / F9X M8 Primary and Secondary Downpipes bolt directly to the factory exhaust system using OEM mounting locations and include all necessary hardware and gaskets for a clean, hassle-free install.

For enthusiasts looking to elevate their F90 M5 / F9X M8 beyond factory limitations without compromising fitment or refinement, the HUKSN Primary and Secondary Downpipes deliver balanced performance, thermal control, and OEM-level integration, engineered for both daily driving and spirited use.