01
Anti-rattle valve
An upgraded flapper valve spring reduces unwanted vibration and noise while retaining factory electronic control.
B58 · G20 / G22 / G23 / G26
BMW M340i/M440i Stainless Steel Exhaust System
A full cat-back system that gives the B58 a deeper, more aggressive voice without introducing highway drone.
$2,195.00
Flexible payment options available at checkout.
- Full 304 stainless steel cat-back construction
- Retains factory electronic valve control
- Refined at cruise. Aggressive under throttle.
Confirmed BMW fitment
2020–2024 M340i and 2021–2024 M440i, including xDrive.
Ships for $49 · Secure checkout
2-Year WarrantyUnlimited-mile parts coverage
U.S. Based Support(866) 558-4314
130+ Dealers WorldwideReady to Install
The sound of the B58, released
Quiet when you want it. Alive when you don’t.
A deep, powerful note under throttle with the refinement to disappear at highway speed. More character without the constant noise.
CAT-BACK
Complete system
304
Stainless steel
OEM
Valve control
ZERO
Highway drone
Purpose-built engineering
Engineered for real driving—not just cold starts.
The difference is in the details you hear, feel and never have to think about: precise fitment, durable materials and factory-level behavior.
02
Joggle-slot joints
Purpose-designed connections improve sealing integrity and help prevent the leaks common in lower-quality systems.
03
OEM-quality fitment
Premium clamps, mounting geometry and carefully specified construction create a precise, factory-like installation.
Fitment & installation
Built for your BMW.
Direct bolt-on fitment for supported M340i and M440i models. Professional installation is recommended for correct alignment and valve operation.
- Chassis
- G20, G22, G23 and G26
- Installation
- Approximately 2 hours
- Part number
- CBB07-00-4268
- Warranty
- 2 years · Unlimited mileage
The CarBahn philosophy
“More performance. More character. Still engineered like it belongs on the car.”
Designed by Steve Dinan and the CarBahn engineering team
Before you buy
Questions, answered.
Does it drone?+
No. The system is engineered to remain smooth and drone-free during highway cruising.
Does it retain the factory exhaust valves?+
Yes. It retains factory electronic valve control and adds an anti-rattle spring design for quieter operation.
Does it require tuning?+
No ECU tune is required to install or operate this cat-back exhaust system.
Will it trigger a check-engine light?+
A properly installed cat-back system does not alter the emissions-control components that normally trigger a check-engine light.
How long does installation take?+
Plan on approximately two hours. Professional installation is recommended.
What warranty is included?+
CarBahn covers the system with a two-year, unlimited-mile parts warranty.
Engineered without compromise
Give your B58 its voice.
Aggressive under throttle. Refined at cruise. Built to fit like it belongs there.
Configure yours