CarBahn Stainless Steel High-Flow Exhaust System – BMW G90 M5 (Cat-Back)
Experience the next level of performance and sound for the BMW G90 M5 with the CarBahn Stainless Steel High-Flow Exhaust System — a full cat-back solution engineered to deliver refined aggression without compromise. Designed and specified by Steve Dinan and the CarBahn engineering team, this system blends motorsport performance with OEM-level drivability.

Constructed entirely from premium stainless steel, this exhaust is built to handle extreme heat cycles and long-term use while maintaining its structural integrity and finish. Unlike simple axle-back upgrades, this is a true cat-back system designed to improve exhaust flow, reduce backpressure, and unlock the full character of the G90 platform.

Intelligent Sound, Engineered for Real Driving
The CarBahn exhaust retains the factory catalytic converters and integrates seamlessly with the OEM electronic valve control system. Under normal driving conditions, the valves remain closed to deliver a refined, mellow tone with zero drone — perfect for daily driving and long-distance comfort.

At wide open throttle, the system comes alive. The factory-controlled valves open to increase exhaust flow, producing a deeper, more aggressive tone that matches the performance of the G90 M5 — without excessive volume or harshness. The result is a true dual-character exhaust: quiet when you need it, aggressive when you want it.

Engineered Fitment — No Compromises
This system is built to CarBahn’s exacting specifications, ensuring precise fitment, proper alignment, and OEM-level installation quality. Every connection point is designed for a secure, leak-free seal, eliminating the inconsistencies often found in generic aftermarket systems.

Premium Finishes and Options
The system comes standard with stainless steel exhaust tips for a clean, performance-oriented look. For a more aggressive, high-end finish, optional CarBahn carbon fiber exhaust tips are also available.

Key Features:

• CarBahn-specified design engineered by Steve Dinan for the G90 M5
• Full stainless steel cat-back system — not just mufflers
• Retains OEM catalytic converters and electronic valve control
• Dual-character sound: refined and quiet in comfort, aggressive at WOT
• Zero drone during cruising and highway driving
• Improved exhaust flow and reduced backpressure
• Precision-engineered fitment for OEM-quality installation
• Stainless steel tips included, with optional carbon fiber upgrade available
• Direct bolt-on system for the BMW G90 M5
• Backed by CarBahn engineering and USA-based support

Installation Support
Ensure a proper, leak-free installation by following our official exhaust clamp guide.
View the step-by-step installation PDF for best results.

The History of How We Got Started

CARBAHN Autoworks is led by Steve Dinan, a luxury car enthusiast just like you. His vast experience with high-powered BMW performance is more than just a hobby. He even took his BMW expertise to the race track, where he gained firsthand knowledge about maximizing your BMW’s potential. From behind the wheel of a BMW, he’s gained a more in-depth knowledge and understanding of how to maximize their performance and potential. CARBAHN Autoworks reputation for unmatched technical knowledge and attention to detail builds from a lifetime in the auto service industry. In fact, it’s our exceptional service, state-of-the-art diagnostic technology, and competitive pricing that make CARBAHN Autoworks the premier alternative to dealer service for complete BMW and Mercedes repair. As an automotive and race engineer Steve’s passion for these superior vehicles translates into a deep understanding of, and intense commitment to how they perform. In 1979, he started the largest company in North America dedicated to BMW high performance (Dinan Engineering). He was acting CEO and Technical Director for 36 years. Dinan secured a contract with BMWNA in 1997 and is the only company that has approval to sell their product out of BMW dealers. Sixteen years as a racing driver retiring from driving in 1996. A racing chassis engineer for 10 years. A racing engine supplier for 10 years. Steve Dinan has won 11 championships including two 24 hours of Daytona!