Scorpion Exhaust Decat Downpipe For BMW F20 & F21 M135i

The Scorpion Exhaust Decat Downpipe for the BMW F20 and F21 M135i is a high-performance upgrade that removes the restrictive factory catalytic converter, freeing up exhaust gas flow for sharper throttle response, quicker turbo spool, and a significantly more aggressive exhaust note. Designed specifically for BMW’s N55-powered M135i, this downpipe unlocks the full potential of the engine when paired with the correct ECU calibration.

Manufactured in the UK from T304 motorsport-grade stainless steel, the Scorpion Decat Downpipe offers exceptional strength, durability, and weight savings over the OEM component. Precision mandrel-bent pipework ensures optimised flow and a direct fit to both OEM and Scorpion exhaust systems.

Two fitment versions are available depending on the turbocharger type:

• SBMC066 – Pre-June 2013 (PWG, pneumatic wastegate)

• SBMC067 – Post-June 2013 (EWG, electronic wastegate)

Key Features:

• Compatible with BMW F20/F21 M135i (2012–2016, N55 engine)

• Removes restrictive OEM catalyst for maximum flow and performance

• Available in two fitment versions:

  • SBMC066 – PWG (before June 2013)

  • SBMC067 – EWG (after June 2013)

• Significantly improves throttle response and turbo spool time

• Enhances exhaust tone for a louder, more aggressive sound

• Designed to fit seamlessly with OEM or Scorpion exhaust systems

• Constructed from T304 stainless steel for strength and corrosion resistance

• Precision-engineered and manufactured in the UK since 1992

• Covered by Scorpion’s lifetime guarantee*

Compatibility:

• BMW F20 M135i 5-Door (2012–2016)

• BMW F21 M135i 3-Door (2012–2016)

Unlock the performance of your BMW M135i with the Scorpion Decat Downpipe – a stainless steel upgrade that delivers maximum flow, faster response, and an aggressive exhaust soundtrack.