BMW N63 / N63TU 550i 650i 750i X5 X6 Catless Downpipes (2011–2017)
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SS304 High-Flow Catless Downpipes for BMW 550i, 650i, 750i, X5 & X6 N63 Twin-Turbo V8 Models
Designed for compatible BMW 550i, 650i, 750i, X5 and X6 models powered by the N63 / N63TU 4.4L twin-turbo V8, these catless performance downpipes replace the restrictive factory primary catalytic converter sections with a significantly freer-flowing exhaust path. The reduced restriction directly after the turbochargers helps improve exhaust gas flow while delivering a deeper, louder V8 exhaust note and increased turbocharger character.
Manufactured from high-quality SS304 stainless steel, the downpipes are built to withstand the extreme exhaust temperatures generated directly after the twin turbochargers while providing excellent corrosion resistance, strength and long-term durability. The catless configuration eliminates the restrictive factory catalyst sections to maximise post-turbo exhaust flow for performance-focused N63 builds.
The vehicle-specific pipe routing is designed around the factory N63 / N63TU turbocharger and exhaust connection points. Original oxygen sensors and applicable OEM mounting hardware should be transferred during installation where required. Because BMW used different downpipe-to-midpipe connection styles across N63 production, the factory connection type should be verified before ordering.
Professional installation is strongly recommended due to the turbocharger connections, oxygen sensor locations and limited access around the factory exhaust system.
Key Features:
- SS304 stainless steel construction
- Twin catless downpipe design
- Designed for BMW N63 / N63TU 4.4L twin-turbo V8
- Compatible with selected BMW 550i / 650i / 750i models
- Compatible with selected BMW X5 50i / X6 50i models
- Removes restrictive factory primary catalytic converters
- Maximum-flow post-turbo exhaust configuration
- Reduced exhaust backpressure
- Increased turbocharger sound
- More aggressive V8 exhaust tone
- High-temperature resistant construction
- Excellent corrosion resistance
- Vehicle-specific exhaust routing
- Factory connection style should be verified before ordering
- Professional installation strongly recommended
Package Includes:
- 1 × Pair of SS304 Catless Downpipes
Important Notice:
This product is intended for off-road, track and motorsport use only. Removal of factory catalytic converters may not comply with emissions or public road-use regulations in your country or region.
Installation of catless downpipes may trigger a Check Engine Light (CEL) due to changes in catalytic converter and oxygen sensor monitoring. Appropriate ECU software or calibration may be required depending on the vehicle setup.
BMW N63 / N63TU vehicles were produced with different downpipe-to-midpipe connection styles depending on production date and chassis. Please verify the original exhaust connection before ordering.
It is the customer's responsibility to confirm all applicable local emissions, inspection and road-use regulations before purchasing or installing this product.