Milltek 80mm Secondary Catalyst Bypass - BMW 5 Series M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW Spec Vehicles) - SSXBM1415

Milltek 80mm Axle Back Secondary Catalyst Bypass system engineered for use with Milltek Axle Back and Downpipe exhausts. Hand-finished T304L stainless steel construction with OEM+ fitment and direct bolt-on installation. Designed to optimize exhaust flow and acoustic character when paired with Milltek performance systems.

Precision mandrel-bent tubing and CNC-formed components ensure seamless integration. T304L stainless steel resists corrosion and thermal stress. No modification required — uses factory mounting points and OEM hangers for direct fitment.

• Compatible with Milltek Axle Back exhaust systems
• Compatible with Milltek Downpipe platforms
• Hand-finished T304L stainless steel construction
• Mandrel-bent tubing for optimal flow
• OEM+ direct bolt-on installation
• Factory mounting point fitment

Engineered to Exhilarate.

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Specifications

• Pipe diameter: 80mm (3.15")
• Fitting time: 2 to 3 hours, including removing the factory system
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• BMW > 5 Series > M5 4.4l Twin Turbo Hybrid G90 & G99 (NAS/ROW Spec Vehicles) > 2025 and Later

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.