Milltek Large Bore Downpipe Hi-Flow Sports Cat - Mercedes C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 - SSXMZ118

OEM catalysts restrict exhaust gas flow and limit performance. The Milltek Large Bore Downpipe with Hi-Flow Sports Catalyst reduces restriction over OE units, enabling a free-flowing exhaust system that improves engine performance and response. This integrated downpipe and sports cat assembly is engineered for direct factory fitment.

Fitment & Installation:

• Direct replacement for OE primary and secondary catalysts
• Gearbox removal required for installation
• Compatible with OE cat-back systems and Milltek cat-back exhausts
• Requires Stage 2 ECU remap for optimal performance

Construction: T304L stainless steel, mandrel-bent large bore piping with hi-flow catalyst core engineered to maximize exhaust velocity while maintaining structural integrity. Hand-finished for OEM+ presentation.

Milltek performance downpipes deliver measurable gains when paired with ECU optimization and full exhaust system upgrades.

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

Specifications

• Pipe diameter: 76.2mm (3.00")
• Fitting time: 4 to 5 hours, including removing the factory system
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• Mercedes > C-Class > C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 (Non-GPF Equipped Models Only) > 2015 and Later
• Mercedes > E-Class > E63S AMG (W213) 4.0 Bi-Turbo Saloon & Wagon > 2016 Onwards

• 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.