BMW F12 F13 640i N55 catted turbo downpipe kit - Supersprint HJS 100 CPSI

Direct-fit catted turbo downpipe for the BMW F12/F13 640i with N55 engine (07/2013 onwards). Uses a genuine HJS Motorsport 100 CPSI metallic catalyst and Supersprint’s precision stainless steel fabrication.

Delivers faster spool, sharper throttle response and a richer exhaust tone - while remaining MOT-legal and emissions-compliant.

• Bolt-on fitment; no cutting, welding or modification needed
• 130 mm high-flow cat core balances flow and conversion efficiency
• Compatible with stage 1 and stage 2 ECU tuning
• Supersprint 3-year warranty, UK-supported

Note: An ECU tune or piggyback module is required to prevent fault codes and unlock full benefits.