Milltek Large Bore Downpipe Pair - BMW F80 M3 F82 M4 - SSXBM1030

Milltek Large Bore Downpipe Pair with Hi-Flow Sports Catalysts for BMW F80 M3 and F82 M4. Direct bolt-on upgrade fabricated in T304L stainless steel with mandrel-bent construction. Larger diameter than OEM reduces backpressure and increases exhaust scavenging efficiency, delivering measurable performance gains and refined sound character when paired with a Milltek cat-back exhaust system.

Hand-finished T304L stainless construction with CNC-formed flanges and OEM-style hangers. Hi-Flow Sports Catalysts maintain emissions compliance while maximizing flow. Stage 2 ECU remap required for optimal results. Installation requires two lambda sensor extensions (BMW part 18307851168, available from any BMW dealer). Uses factory bolt points—no welding or modification required.

Fitment Details

• BMW F80 M3 (2014-2018) with S55 engine
• BMW F82 M4 (2014-2018) with S55 engine
• Requires Milltek cat-back exhaust system for complete integration
• Not compatible with factory M Performance exhaust

Fits Milltek Cat-Back.

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

Specifications

• Pipe diameter: 76.2mm (3.00")
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• BMW > 3 Series > F80 M3 & M3 Competition Saloon (Non OPF/GPF Models Only) > 2014 to 2018
• BMW > 4 Series > F82/83 M4 Coupe/Convertible & M4 Competition Coupe > 2014 to 2018

• 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.