Stone Exhaust BMW B58 F30 F32 OEM Integrated Valved Catback Exhaust System for BMW 340i and BMW 440i - the ultimate BMW B58 cat back exhaust upgrade for F30 340i and F32 440i owners who want a valved, OEM-integrated, plug-and-play performance exhaust with stunning sound, perfect fitment and premium build quality. If you are searching for BMW 340i exhaust, BMW 440i exhaust, B58 cat back, F30 340i catback exhaust, F32 440i catback exhaust, valved exhaust for 340i, valved exhaust for 440i or BMW B58 valvetronic exhaust, this is the system enthusiasts choose.
We have installed and used this Stone Exhaust BMW B58 valved cat-back on customer 340i and 440i cars and the feedback has been outstanding. Fitment is spot on, valve control integrates seamlessly with OEM, and the sound is refined with valves closed and aggressive with valves open. It is a brilliant exhaust upgrade for daily driving and spirited use.
Why choose the Stone Exhaust Valved Cat-Back for BMW 340i and 440i
- OEM integrated valved catback exhaust for BMW B58 F30 F32 340i and 440i
- Plug and play OBDII controller for simple installation and reliable valve control
- One piece design for precise fitment and optimal exhaust flow
- Machine welding for consistency, strength and a premium finish
- In-house research and development with 3D scanning and reverse engineering
- Designed for sound, performance and durability on BMW B58 engines
Free OPF delete solution for OPF-equipped cars
Stone includes an OPF delete solution free of charge. This allows you to fit the Stone cat-back exhaust to OPF-equipped vehicles without triggering error codes, so no ECU coding is required. Ideal if you are searching for OPF delete BMW 340i exhaust or OPF delete BMW 440i exhaust solutions.
Engineering that sets the benchmark
R&D and 3D Scanning
Stone Exhaust engineers 3D scan OEM parts to precisely map pipe diameter, routing and bend angles on the BMW B58 F30 F32 340i and 440i exhaust system. Using advanced flow, thermal and pressure simulation, they iterate until optimal performance is achieved.
7 Axis CNC Bending
Constructed on a 7 axis CNC bending machine for aerospace-level precision. Stone achieves an impressive 98 percent roundness while keeping outer bore wear at only 25 percent at 180 degrees. Airflow obstruction is minimised and weld fracture issues are prevented. Combined with 3D scanning, the exhaust tubing is integrally formed with accuracy under 0.025 mm for superb fitment on BMW 340i and 440i.
Advanced welding techniques
Crisscross and overlapping welds increase penetration and width, boosting endurance where temperatures are extreme. Direct spot welding with mechanical arms delivers precise, strong and consistent welds, resulting in a robust, long-lasting BMW B58 catback exhaust that looks as good as it performs.
Valve control options
This OEM integrated valved BMW B58 cat-back works with your factory valve strategy. You can also add the optional Stone Valvetronic System single valve to control the valves remotely using the Stone remote controller if you want hands-on control of loud and quiet modes.
Perfect pairing for more performance
Often purchased with:
- Stone Exhaust BMW B58 Catless Performance Downpipe (includes M140i, M240i, 440i, 540i, 740i and X5 M40i)
- Stone Exhaust BMW B58 Eddy Catalytic Performance Downpipe (includes M140i, M240i, 440i, 540i, 740i and X5 M40i)
Combine a B58 downpipe with this BMW 340i catback or BMW 440i catback for enhanced sound and response.
Compatibility - BMW B58 Engine
BMW 3 Series
- F30 LCI / F31 LCI 340i / 340i xDrive 2014 to 2018
BMW 4 Series
- F32 / F32 LCI 440i / 440i xDrive 2015 to 2017
- F33 440i 2015 to 2017 / 440i xDrive 2013 to 2017
- F33 LCI 440i / 440i xDrive 2016 to 2018
- F36 440i / 440i xDrive 2015 to 2017
- F36 LCI 440i / 440i xDrive 2016 to 2018
Part numbers and tailpipe options
- AP514B58 - Dual exit with twin tailpipes - requires original bumper
- AP514QB58 - Dual exit with quad tailpipes - requires M Sport bumper
Key features at a glance
- STONE Valvetronic BMW B58 F30 F32 340i and 440i
- OEM integration for factory-style valve control
- Plug and play OBDII controller
- One piece design
- Machine welding
- In house research and development
- 3D scanning and reverse engineering
Warranty
Stone Exhaust 2 year warranty.
Professional fitting available
For installation and coding advice, Nforcd offers professional fitting in Warwickshire. Email Sales@nforcd.com to request a quote and schedule your BMW 340i exhaust or BMW 440i exhaust upgrade.
If you are searching for BMW 340i cat back exhaust, BMW 440i cat back exhaust, BMW B58 valved exhaust, BMW F30 exhaust upgrade, BMW F32 exhaust upgrade, 340i valved exhaust, 440i valved exhaust, OPF delete exhaust for BMW 340i or OPF delete exhaust for BMW 440i, this Stone Exhaust system delivers the sound, quality and fitment you want.