The Evolution Racewerks Sports Series 4" High-Flow Catted Downpipe is engineered to unlock superior performance for your BMW N26 4-cylinder turbo engine. Featuring a 200-cell metallic catalytic converter, mandrel-bent 4" stainless steel tubing, and precision-built components, this downpipe significantly improves exhaust flow, reduces backpressure, and enhances throttle response, torque delivery, and turbo spool time.

Constructed in the USA with 100% TIG-welded 304 stainless steel, this downpipe maintains factory-level reliability while delivering measurable gains. The design includes a stainless-steel flex section for proper movement, a CNC-machined turbo V-band flange, and ER’s signature CNC-machined billet stainless “ball” joint to ensure smooth, uninterrupted exhaust flow.

Key Features

• Made in the USA
• 4" mandrel-bent piping with smooth transitions
• High-flow 200-cell metallic catalytic converter
• Increased horsepower and torque
• Faster turbo spool and improved throttle response
• CNC-machined turbocharger V-band flange
• CNC-machined billet stainless exhaust “ball” joint
• 100% TIG-welded 304 stainless steel
• Stainless-steel flex section for factory-like movement
• Brushed or mirror-polished finish options
• Optional black ceramic thermal coating (2000°F rated)
• Optional additional O2 sensor bung
• Optional EGT bung
• Compatible with OEM and aftermarket exhaust systems
• Includes all required installation hardware
• Limited Lifetime Warranty
• For off-road/competition use only (49-state legal; not for California)

Fitment 

Compatible With:
• 2012 BMW 320i (N26 engine only)
• 2013 BMW 320i (N26 engine only)
• 2014 BMW 320i (N26 engine only)
• 2015 BMW 320i (N26 engine only)

• 2012 BMW 328i (N26 engine only)
• 2013 BMW 328i (N26 engine only)
• 2014 BMW 328i (N26 engine only)
• 2015 BMW 328i (N26 engine only)

• 2012 BMW 420i (N26 engine only)
• 2013 BMW 420i (N26 engine only)
• 2014 BMW 420i (N26 engine only)
• 2015 BMW 420i (N26 engine only)

• 2012 BMW 428i (N26 engine only)
• 2013 BMW 428i (N26 engine only)
• 2014 BMW 428i (N26 engine only)
• 2015 BMW 428i (N26 engine only)

Note: Does not fit N20 engine variants.

This high-flow catted downpipe is compatible with factory or aftermarket exhaust systems and available in polished or brushed finishes. Optional thermal coating, wideband O2 bung, and EGT bung allow further customization. Built with track-tested durability, this system is designed for performance without compromise.