3.5" Turbo Catless Downpipes – BMW M2 / M3 / M4 (S55)

Designed for maximum performance on BMW S55 platforms, these 3.5-inch catless turbo downpipes significantly improve exhaust flow by eliminating factory catalytic restrictions. The result is faster turbo spool, sharper throttle response, and substantial power gains when paired with proper ECU tuning.

Constructed from high-quality SS304 stainless steel and fully TIG welded, these downpipes are built to handle high heat and aggressive driving while maintaining excellent fitment with both factory and aftermarket exhaust systems.

Product Features

• Catless design for maximum exhaust flow and performance

• Mandrel-bent 3.5" stainless steel piping with smooth transitions

• 100% SS304 stainless steel construction for durability and corrosion resistance

• Fully TIG welded flanges and O2 sensor bungs

• Precision CNC-machined turbo V-band flanges

• Retains OEM catalytic heat shield

• Factory-style exhaust hangers for proper support

• Compatible with OEM and aftermarket exhaust systems

• Designed to support significant horsepower and torque gains

• Improves throttle response and turbo spool

Performance Notes

• Expected gains of 30+ wheel horsepower and 35+ wheel torque with proper tuning

• ECU tuning required to prevent check engine lights

• Intended for off-road / track use only, not for street use

• Not emissions compliant for street use in most regions

Fitment

• BMW M2 (F87)

• BMW M3 (F80)

• BMW M4 (F82 / F83)

• 2015+ models with S55 engine

• Fits both Left-Hand Drive and Right-Hand Drive vehicles

Please verify exact year and model compatibility before purchase.

Package Includes

• 2x Catless Turbo Downpipes

• Hardware as shown in product images

Installation

• Direct bolt-on replacement

• Professional installation highly recommended