Stone Exhaust BMW N20 F30 F32 OEM Integrated Valved Cat-Back Exhaust System - 320i and 420i
Looking for the best BMW 320i exhaust upgrade or BMW 420i exhaust upgrade for your N20 engine car? The Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System delivers the sound, response and quality BMW F-Series owners demand. Designed for BMW F30 320i, F31 320i Touring, F32 420i, F33 420i Convertible and F36 420i Gran Coupe, this valved catback exhaust blends daily comfort with a deeper, sportier tone and proven performance gains. OEM integration means the factory ECU controls the valve operation automatically, so you keep factory refinement with a more exciting drive when you want it.
Trusted by enthusiasts and used by our team, this Stone Exhaust system has impressed our customers with its refined, drone-free cruising and a crisp, aggressive note under load. If you are searching for BMW F30 exhaust, BMW F32 exhaust, BMW 320i catback, BMW 420i catback, BMW N20 valved exhaust or switchable exhaust for BMW, this is the premium cat-back exhaust solution for road and performance use.
Why choose the Stone OEM Integrated Valved Catback for your BMW N20
- BMW N20 catback exhaust engineered for F30 F31 F32 F33 F36 320i and 420i models
- OEM Integrated Valve - valve operation controlled by the car’s ECU for seamless comfort and performance
- Signature Stone Exhaust sound - deeper, sportier tone with minimal drone compared to the standard exhaust
- 3D scanned and reverse engineered from the OEM system for precise 100 percent OEM fitment
- In-house dyno developed - designed to improve flow and response
- One-piece design with precision mechanical welding for strength and durability
- Eliminates drone often found on the stock exhaust system
Optional upgrade - Stone Valvetronic System
Prefer full control of your BMW valve exhaust? Add the Stone Valvetronic System, a single-valve setup that lets you open and close the exhaust valve via the Stone remote controller. The Valvetronic upgrade includes a plug and play OBDII controller for an easy, clean install. Perfect if you want a truly switchable BMW 320i or 420i exhaust that can go from quiet to aggressive on demand.
Real-world sound and development
Precision engineering and manufacturing
Stone Exhaust develops systems using advanced 3D scanning to reverse engineer OEM parts, analyse pipe diameter, routing and bend angles, and then simulate gas flow, temperature and pressure zones. The result is an accurately tuned BMW N20 exhaust that fits like factory and performs with consistency.
Manufactured using a 7 axis CNC bending machine, Stone achieves up to 98 percent roundness and excellent dimensional accuracy. Combined with crisscross and overlapping welds at critical high temperature joints, plus direct spot welding by mechanical arms, each exhaust is built to deliver strength, precision and long-term reliability.
Fitted photos
Compatibility - BMW N20 engine
BMW 3 Series
- F30 320i and 320i xDrive 2011 plus
- F30 LCI 320i and 320i xDrive 2014 plus
- F31 320i 2011 plus and 320i xDrive 2012 plus
- F31 LCI 320i and 320i xDrive 2014 plus
BMW 4 Series
- F32 420i and 420i xDrive 2013 plus
- F32 LCI 420i and 420i xDrive 2016 plus
- F33 420i 2013 plus and F33 LCI 2016 plus
- F36 420i and 420i xDrive 2013 plus
- F36 LCI 420i and 420i xDrive 2016 plus
Part numbers and tailpipe options
- AP502 - Single exit left with twin tailpipes - requires original bumper
- AP502N - Dual exit with twin tailpipes - requires 335i or 435i bumper
- AP502NQ - Dual exit with quad tailpipes - requires 335i or 435i bumper
Installation and fitting
Professional fitting is recommended for the best results. For expert installation, book with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com. We are happy to help with product advice, availability and lead times.
Warranty
Stone Exhaust 2 year warranty.
Manufactured by
Stone Exhaust
Search friendly keywords
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