MBS 3-Inch Catless Downpipes | BMW F80 M3 | F82/F83 M4 | F87 M2 Competition | S55

MBS 3-Inch Catless Race Downpipes

BMW F80 M3 | F82/F83 M4 | F87 M2 Competition

Improve exhaust flow, turbocharger response, and sound from your S55-powered BMW with the MBS 3-Inch Catless Race Downpipes.

Designed to replace the restrictive factory catalytic downpipes, this system significantly reduces exhaust back pressure and supports quicker turbo spool, sharper throttle response, and a deeper, more aggressive exhaust note.

Unlike downpipes that narrow significantly toward the outlet, the MBS design maintains a full three-inch diameter through most of the piping to support increased exhaust flow. Each downpipe is manufactured from SS304 stainless steel and features a cast stainless-steel V-band-to-pipe transition for strength, proper fitment, and dependable performance.

When combined with compatible engine tuning, the manufacturer estimates potential gains of up to approximately 25 horsepower and 30 lb-ft of torque. Actual results will vary based on tuning, fuel, supporting modifications, vehicle condition, and environmental conditions.

Product Features

• Full three-inch catless downpipe design
• Helps reduce restrictive factory exhaust back pressure
• Supports quicker turbo spool and improved response
• Produces a deeper and more aggressive exhaust note
• SS304 stainless-steel construction
• Cast stainless-steel V-band-to-pipe transitions
• Maintains three-inch piping through most of the system
• Precision-manufactured for vehicle-specific fitment
• Compatible with S55-powered BMW M vehicles
• Manufacturer-estimated gains of up to 25 horsepower and 30 lb-ft with compatible tuning
• Designed for performance and competition-focused applications

Vehicle Fitment

• BMW M3 F80 — S55 engine
• BMW M4 Coupe F82 — S55 engine
• BMW M4 Convertible F83 — S55 engine
• BMW M2 Competition F87 — 2019–2021, S55 engine

Fitment should be confirmed using the vehicle’s VIN and engine configuration before ordering.

Important Notice

This product is not street legal and is intended for closed-course competition or off-road use only.

Removing factory catalytic converters may cause:

• A check-engine light
• Increased emissions
• Increased exhaust odor
• Failure of state or federal emissions inspections
• Possible warranty or legal concerns

Proper engine tuning may be required. The purchaser is responsible for confirming all applicable local, state, and federal laws before ordering or installing this product.

Availability

Available to Order

Contact Uproar Customs for current inventory and estimated lead time.

Installation

Professional installation by an experienced BMW technician is strongly recommended. Exhaust gaskets, clamps, hardware, and surrounding components should be inspected during installation.

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