The Fabspeed BMW N63/S63 Sport Catalytic Converter Downpipes are engineered to enhance exhaust flow, throttle response, and exhaust sound by replacing the restrictive factory catalytic converters with high-performance 200-cell HJS catalytic converters. Designed for BMW N63 and S63 twin-turbocharged engines, this upgrade delivers a more aggressive exhaust note and improved engine responsiveness across the RPM range.

Factory catalytic converters on these vehicles are highly restrictive, limiting exhaust gas flow and muting the natural sound of the twin-turbo V8 engine. Fabspeed Sport Cat Downpipes replace these OEM units with high-flow catalytic converters designed to significantly reduce restriction while maintaining catalyst functionality for improved emissions performance compared to straight-pipe alternatives.

These downpipes are constructed from T304L stainless steel and feature CNC-machined flanges and laser-cut brackets for precise fitment and long-term durability. Each system is manufactured to high standards to ensure strength, corrosion resistance, and reliable performance under demanding conditions.

The use of 200-cell HJS catalytic converters provides a balance between performance and emissions efficiency, allowing increased exhaust flow and improved sound characteristics while maintaining catalyst operation.

Please note that installation of this product may result in a check engine light depending on vehicle condition and calibration. In some cases, an ECU tune may be required to eliminate fault codes and optimize performance.

Features and Benefits

• Replaces restrictive factory catalytic converters
• Designed for BMW N63 and S63 twin-turbo V8 engines
• Compatible with select BMW and Alpina models (2008–2014)
• High-flow 200-cell HJS catalytic converters
• Improved throttle response and engine efficiency
• Enhanced exhaust sound and performance character
• Constructed from T304L stainless steel
• CNC-machined flanges and laser-cut brackets for precision fitment
• Direct bolt-on installation with factory mounting points
• Manufactured in-house for quality control and consistency
• Designed for improved exhaust gas flow over OEM catalytic converters
• Compatible with ECU tuning for optimized performance
• Backed by Fabspeed Lifetime Limited Warranty

Fitment

Vehicle Compatibility:

• BMW X6 xDrive50i (2008–2012)
• BMW X6 ActiveHybrid (2010)
• BMW X6 M (2010–2012)
• BMW X5 xDrive50i (2011–2012)
• BMW X5 M (2010–2012)
• BMW 550i (2011–2012)
• BMW 550i xDrive (2011–2012)
• BMW 550i GT (2010–2012)
• BMW 550i GT xDrive (2010–2012)
• BMW 750i (2010–2012)
• BMW 750i xDrive (2011–2012)
• BMW 750Li (2010–2012)
• BMW 750Li xDrive (2011–2012)
• Alpina B7 (2011–2012)
• Alpina B7L (2011–2012)
• Alpina B7 xDrive (2011–2012)
• Alpina B7L xDrive (2011–2012)

Fitment Notes:

• Designed for BMW N63 and S63 twin-turbo V8 platforms
• Direct replacement for factory catalytic converters
• May require ECU tuning depending on vehicle calibration and modifications
• Installation intended for off-road or closed-course applications where permitted by law

Specifications

• Product Type: Sport Catalytic Converter Downpipes
• Engine Compatibility: BMW N63 / S63 Twin-Turbo V8
• Catalytic Converter Type: HJS High-Flow 200-Cell Catalyst
• Material: T304L Stainless Steel
• Construction: CNC Machined Flanges, Laser-Cut Brackets
• Installation Type: Direct Bolt-On
• Warranty: Fabspeed Lifetime Limited Warranty