Cobb Cat-Back Exhaust BMW 335i Models (inc. 2007-2011 335i)

The Cobb Cat-Back Exhaust for BMW 335i models is a stainless steel mandrel-bent system designed for the N54 twin-turbocharged inline-six. The improved exhaust flow from the catalytic converter outlet complements the Cobb Accessport calibration the N54’s twin-turbo setup benefits from reduced exhaust backpressure in exhaust scavenging and turbocharger efficiency.

DETAILS

• Platform: 2007-2011 BMW 335i (N54 3.0T twin-turbo)
• Material: stainless steel mandrel bent throughout
• Improved exhaust flow vs factory reduced backpressure for N54 twin turbos
• Sound: improved exhaust character over stock tuned for N54 inline-six character
• All hangers, gaskets, and hardware included
• NOTE: Ships via UPS/FedEx signature required at delivery

N54 Twin-Turbo Exhaust Flow and Scavenging Benefits

The N54’s twin-turbo configuration exhausts through a single Y-pipe that combines flow from both cylinder banks before reaching the cat-back system. Reduced backpressure downstream of the catalytic converter benefits turbocharger exhaust side efficiency with lower backpressure at the turbine wheels, the turbos can spool with less energy extracted from the exhaust stream, contributing to improved boost onset characteristics alongside the calibration improvements from the Accessport.

BMW Inline-Six Sound Character and Chassis-Specific Fitment

The Cobb cat-back for the BMW 335i is designed for the N54’s exhaust characteristics and the 335i chassis correct hanger positions, tip placement aligned with the BMW rear fascia opening, and sound tuning appropriate for the inline-six character. The BMW N54 produces a distinctive inline-six exhaust note at full boost that the Cobb cat-back develops further without introducing the drone at cruise that accompanies an inadequately designed resonator.

What’s in the Box

• Cobb stainless cat-back exhaust BMW N54
• All hangers, gaskets, clamps, and hardware

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The Cobb cat-back for the BMW 335i N54 is for BMW performance owners who want their exhaust system to match the level of their Accessport and intake work. The improved exhaust flow complements the N54’s calibration and delivers the exhaust character that the twin-turbo inline-six is capable of.

Fitment