For fitment with the OE exhaust system only. Requires a Stage 2 ECU remap. The range of cast downpipes offers enhancements to gas-flow and heat management, designed to increase efficiency and performance gains. Standard OEM catalysts are usually around 500-600 cells, while the race catalyst reduces this to 200 cells. This makes the catalyst freer-flowing, improving gas-flow and performance. - Designed for use with the OE exhaust system - Race catalyst reduces cell count to 200 for improved flow - Enhances gas-flow and heat management Specifications: - Pipe Diameter: 76.20 - Race Product: Yes - EMarked: No Kit comes with: - MSAU672: Connecting Pipe - MSAU672 - MSVAG06NC: Cast Downpipe with 200CPSI No Cell Race Cat Vehicle Compatibility: - 2015-2018 Audi TT Mk3 TTS 2.0TFSI Quattro (Non-OPF/GPF Models)