Downpipes For BMW M5 (2018-2022) F90 F91 F92 F93 With Twin Turbo 4.4L V8 Engine

Your S63 engine is suffocating. From the factory, the twin-turbo V8 in the M5 and M8 is a masterpiece of engineering choked by restrictive catalytic converters that trap heat and mute the exhaust note. If you are chasing aggressive power gains or simply want your super sedan to sound like it has 600+ horsepower, the restriction has to go.

Performance Catless Downpipes for BMW M5 & M8 (F90/F91/F92/F93)

The "Hot-V" configuration of the BMW 4.4L Bi-Turbo engine places the turbos directly in the valley of the engine. While efficient for packaging, this creates massive heat soak issues when paired with dense, restrictive stock catalytic converters. These UPD Catless Downpipes solve the two biggest complaints owners have with the F90 and F9x chassis: the lack of auditory drama and the heat ceiling that limits tuning potential. By deleting the primary and secondary restrictions, you significantly drop backpressure, allowing the turbos to spool faster and operate cooler.

UPD has engineered these pipes with a specific focus on flow dynamics. Unlike generic straight pipes, these feature a raised expansion area immediately after the turbo flange. This design mimics the visual profile of the OEM unit but serves a functional purpose: it creates a venturi effect that accelerates exhaust velocity while reducing turbulence right out of the turbine housing. The result is a sharper throttle response and a reduction in Intake Air Temperatures (IATs), which is critical for maintaining consistent power during repeated pulls.

Construction is handled by CNC-machined flanges and mandrel-bent 304 stainless steel, ensuring the piping can withstand the extreme thermal cycles of the S63 engine without cracking. The kit is a comprehensive solution, replacing both the primary and secondary sections for a true high-flow setup. Integrated flex joints are included to absorb engine movement and chassis vibration, preventing stress fractures at the mounting points. This is a direct bolt-on solution that reuses your factory mounting locations and brackets for a straightforward installation.

Why You Need This Upgrade

• Maximize Tuning Potential: The 3" (76mm) diameter tubing supports aggressive Stage 2 tunes and larger hybrid turbo setups that require high-flow exhaust evacuation.
• Venturi Flow Design: Features a raised section post-turbo to reduce backpressure and maintain high exhaust velocity compared to standard straight pipes.
• Thermal Management: Removing the catalytic restriction significantly lowers under-hood temperatures and IATs, preserving turbo life.
• The V8 Sound: Unlocks the true twin-turbo V8 growl and turbo spool whistle that is completely silenced by the factory system.
• OEM Integration: Designed to mate perfectly to your stock catback exhaust or aftermarket systems with factory-style connections.

Installation Notes

This system is a one-piece design per side to minimize leak points and connection hardware. It is designed to mount to all OEM brackets to ensure fitment accuracy. Please note that bolts are included, but you must reuse your OEM band clamps. Due to the removal of the catalytic converters, this product will trigger a Check Engine Light (CEL) for catalyst efficiency unless the vehicle is tuned or O2 spacers are utilized. This product is sold for off-road and racing use only.

Replaces These OEM Applications

• 2018-2022 BMW M5 Sedan (F90)
• 2018-2022 BMW M5 Competition (F90)
• 2019-2022 BMW M8 Convertible (F91)
• 2019-2022 BMW M8 Coupe (F92)
• 2019-2022 BMW M8 Gran Coupe (F93)
• Fits 4.4L V8 Bi-Turbo & Competition Models

UPD BMW CATLESS 3"

Transform the character of your M-Car today. By deleting the restrictive factory cats, you aren't just gaining horsepower; you are increasing the longevity of your turbos through better heat management and finally getting the sound this V8 deserves.