Stone Exhaust BMW N26 F20 F21 125i Cat-Back Valvetronic Exhaust - Part Number AP506NSN26
Upgrade your BMW 1 Series 125i with the Stone Exhaust Cat-Back Valvetronic Exhaust for the N26 engine. This premium BMW F20 F21 125i cat-back exhaust delivers a deep, motorsport-inspired tone with a valved, switchable system for quiet cruising or aggressive sound on demand. Engineered for 100% OEM fitment and developed on the dyno, this BMW 125i performance exhaust improves throttle response, enhances power and eliminates the drone found on the standard exhaust system.
If you are searching for a BMW 125i exhaust, BMW F20 125i exhaust, BMW F21 125i exhaust, BMW N26 cat-back, valvetronic exhaust, valved catback, switchable exhaust, or performance exhaust for BMW 1 Series, this Stone Exhaust system is the proven, plug and play solution trusted by enthusiasts across the UK.
Why choose Stone Exhaust for your BMW 125i N26
Since 1998, Stone Exhaust has refined exhaust design using 3D scanning and reverse engineering of OEM systems to create precision-fit, high-flow systems. The result is an expertly crafted BMW 125i catback exhaust that looks, fits and sounds exceptional, with performance to match. At Nforcd we have installed and used this system, and our customers consistently praise the quality, fitment and the controllable sound it offers for daily driving and spirited use.
Key features
- BMW N26 F20 F21 125i Cat-Back Valvetronic Exhaust by Stone Exhaust
- Valvetronic system with remote control - On, Off and Auto modes
- Plug and play OBDII controller - quick, simple installation
- One piece design for optimal flow and easy fitment
- Engineered using 3D scanning and reverse engineering of the OEM exhaust
- 7 axis CNC bending for exceptional precision and flow
- Mechanical welding with crisscross and overlapping techniques for durability
- Dyno developed in house for real performance gains
- Eliminates the drone commonly found on the standard 125i exhaust
- Stone Exhaust 2 year warranty
- Part Number: AP506NSN26
Valvetronic control - quiet when you want it, loud when you need it
The Stone Valvetronic system includes a separate remote controller that lets you open or close the valves at the press of a button. Choose On for maximum sound and flow, Off for a refined OEM-plus tone, or Auto to open the valves automatically at a predefined RPM. The system is plug and play via the OBDII port for a clean, tidy installation.
R&D, 3D scanning and precision manufacturing
Stone engineers 3D scan OEM components to analyse pipe diameters, routing and bend geometry, then simulate exhaust gas flow, thermal and pressure zones to optimise performance. With 7 axis CNC bending achieving up to 98% roundness and superb dimensional accuracy, plus advanced welding techniques to handle extreme heat cycles, this BMW 125i F20 F21 N26 cat-back exhaust is built to perform and built to last.
Installation video
Sound clip
Compatibility - BMW 1 Series 125i N26
- F20 and F20 LCI 125i 2014+ (requires M135i bumper)
- F21 and F21 LCI 125i 2010+ and 2014+ (requires M135i bumper)
Part number
AP506NSN26
Fitting service
Professional fitting available at Nforcd in Warwickshire. To request a fitting quote or to book installation for your BMW F20 F21 125i N26 cat-back valvetronic exhaust, email Sales@nforcd.com.
Warranty
Stone Exhaust 2 year warranty for peace of mind.
Trusted BMW 125i exhaust upgrade from Nforcd
As BMW tuning specialists, we recommend the Stone Exhaust BMW 125i N26 Cat-Back Valvetronic system for drivers who want a premium, valved, switchable performance exhaust with OEM fitment and daily drivability. Order with confidence and transform the sound and response of your BMW 1 Series today.
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