MAD High-Flow Catted Primary Downpipes | BMW F90 M5 | F91/F92/F93 M8

MAD High-Flow Catted Primary Downpipes

BMW F90 M5 | BMW F91/F92/F93 M8

Improve exhaust flow, turbo response, and sound while retaining high-flow catalytic converters with the MAD Primary Catted Downpipes. Designed for S63-powered BMW M5 and M8 models, these downpipes replace the restrictive factory primary downpipes with a performance-focused, direct-fit upgrade.

Constructed from premium T304 stainless steel, each downpipe features smooth mandrel bends and carefully designed transitions to reduce turbulence and improve exhaust-gas flow. The integrated 200-cell high-flow catalytic converters provide a less restrictive exhaust path while delivering a more aggressive exhaust note.

Integrated flex sections help accommodate natural exhaust movement, while the bolt-on design connects to the factory exhaust system without cutting or welding.

Product Features

• Premium T304 stainless-steel construction
• Integrated 200-cell high-flow catalytic converters
• Smooth mandrel-bent piping
• Reduced exhaust restriction
• Improved exhaust-gas flow
• Supports quicker turbo spool
• Improved throttle-response potential
• More aggressive exhaust note
• Designed to minimize unwanted drone
• Integrated flex sections
• Compatible with right-hand-drive and left-hand-drive vehicles
• Direct bolt-on installation
• No cutting or welding required
• Installation hardware and gaskets included
• Lifetime warranty against manufacturing defects and fitment issues
• 90-day return period

Performance Benefits

• Potential gains of up to 30 horsepower with factory turbochargers
• Additional power potential with upgraded turbochargers
• Improved horsepower and torque potential
• Faster turbocharger response
• Increased exhaust-flow capacity
• More aggressive performance sound

Actual results depend on tuning, fuel quality, supporting modifications, vehicle condition, and testing method.

Vehicle Fitment

• BMW M5 (F90)
• BMW M8 Convertible (F91)
• BMW M8 Coupe (F92)
• BMW M8 Gran Coupe (F93)

Engine: S63 Twin-Turbo V8

Important Notes

• High-flow catalytic converters do not guarantee emissions compliance.
• A check-engine light may still occur depending on the vehicle and ECU calibration.
• ECU tuning may be recommended for maximum performance.
• Confirm local emissions and road-use laws before purchasing.
• Exact fitment should be confirmed before ordering.

Availability

In Stock & Ready to Ship

Orders generally ship within 1–2 business days.

Installation

Professional installation by a qualified BMW performance shop is strongly recommended. Proper exhaust alignment, leak inspection, and clearance verification are required.

Uproar Customs does not provide installation instructions, tuning, emissions-compliance advice, or technical support for self-installation.