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.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

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We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

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All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.