BMW F Series N55 High Flow Sports Cat Downpipe – 200 Cell | M135i M235i 335i 435i 535i X3 X4 X5 X6

BMW F Series N55 | High Flow Sports Cat Downpipe – 200 Cell

Direct-fit 200-cell high flow sports catalytic converter downpipe for all BMW F-series vehicles equipped with the N55 B30 3.0L turbocharged inline-six. Hand-fabricated by Promod Works in polished T304 stainless steel, with precision TIG welds and an integrated lambda sensor port — built to replace the restrictive OEM unit and free up the full performance potential of the N55.

Key Features

• 200-cell high flow catalytic substrate — dramatically reduced backpressure vs OEM
• T304 polished stainless steel construction throughout
• Hand-TIG welded for maximum strength and gas-tight seals
• Integrated O2 / lambda sensor bung (pre-cat position)
• Retains OEM mounting bracket positions — direct bolt-on fitment
• Compatible with OEM and aftermarket cat-back systems
• Significant gains when combined with a stage 2 ECU remap
• Promod Works branded badge plate

Compatibility – All BMW F Series N55 3.0L Models

• BMW M135i – F20, F21 (2012–2016) N55 B30 320 hp
• BMW M235i / 235i – F22, F23 (2014–2016) N55 B30 326 hp
• BMW 335i – F30, F31, F34 (2012–2015) N55 B30 306 hp
• BMW 435i – F32, F33, F36 (2013–2016) N55 B30 306 hp
• BMW 535i – F10, F11 (2010–2016) N55 B30 306 hp
• BMW X3 xDrive35i – F25 (2011–2017) N55 B30 306 hp
• BMW X4 xDrive35i – F26 (2014–2018) N55 B30 306 hp
• BMW X5 xDrive35i – F15 (2013–2018) N55 B30 306 hp
• BMW X6 xDrive35i – F16 (2014–2019) N55 B30 306 hp

Engine: N55 B30 3.0L Turbocharged Inline-6 (all variants above)

Specification

• Material: T304 polished stainless steel
• Catalyst cell density: 200 cell high flow
• Lambda port: Yes (pre-cat O2 sensor bung included)
• Fitment: Direct bolt-on, OEM mounting positions
• Finish: Satin/polished stainless

⚠️ For track and off-road use only. This product is not road legal and is not intended for use on public roads. Fitting this product to a vehicle used on public roads may render it non-compliant with emissions regulations. The buyer accepts full responsibility for compliance with applicable laws.

This product is made to order. Lead times may apply — please contact us for current availability and delivery estimates. Professional installation recommended.