OEM catalysts are often very dense and restrict gas flow. The Milltek Hi-Flow Sports Catalyst reduces restriction compared to OE catalysts, allowing for a free-flowing exhaust system to improve engine performance. This Hi-Flow Sports Cat includes a downpipe, designed to enhance gas flow and maximize the effect of the sports catalyst. - Reduces restriction over OE catalysts - Allows for a free-flowing exhaust system - Includes a downpipe to improve gas flow Specifications: - Pipe Diameter: 76.20 - 4 to 5 hours to fit (including removing OE system) - Race Product: Yes - EMarked: No Kit comes with: - MSMZ96: LH Primary Downpipe - MSMZ96 - MSMZ97: RH Primary Downpipe - MSMZ97 - MSMZ98: LH High Flow Cat Assembly - MSMZ98 - MSMZ99: RH High Flow Cat Assembly - MSMZ99 Vehicle Compatibility: - 2015 and later Mercedes C-Class C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 (Non-GPF Equipped Models Only) - 2016 onwards Mercedes E-Class E63S AMG (W213) 4.0 Bi-Turbo Saloon & Wagon