Stone Exhaust OEM Integrated Valved Cat-Back for BMW N55 F30 F31 F32 F33 F36 335i and 435i
Unlock the sound and performance your BMW N55 deserves with the Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System. Engineered for perfect OEM fitment on BMW 3 Series F30 and F31 335i and 335i xDrive, and BMW 4 Series F32, F33, F36 435i and 435i xDrive, this cat-back exhaust transforms response and tone while keeping daily refinement. Developed using 3D scanning, reverse engineering and in-house dyno testing, the Stone Exhaust delivers proven gains with that signature Stone sound and zero compromise on quality.
Why choose this BMW N55 valved cat-back exhaust
- OEM integrated valve control via the ECU for factory-style operation
- True OEM fitment achieved through 3D scanning and reverse engineering
- In-house dyno developed for real-world performance and a deep, refined tone
- Eliminates the drone typically found on standard exhaust systems
- One-piece design with precision mechanical welding for strength and durability
- Optional Stone Valvetronic System for on-demand loud or quiet with remote control
- Plug and play OBDII controller available with the Valvetronic option
Valves and control options
OEM Integrated Valve: retains factory ECU control, opening and closing the valves automatically for a seamless OEM experience.
Optional Stone Valvetronic System: add the single-valve Valvetronic kit to take manual control. Switch your BMW N55 exhaust from quiet to aggressive at the touch of a button with the Stone remote and plug and play OBDII controller.
Engineering that makes the difference
Stone Exhaust has been perfecting performance exhausts since 1998. Every BMW N55 F30 F31 F32 F33 F36 cat-back benefits from serious R&D and manufacturing precision:
- 3D scanning and reverse engineering of the OEM BMW exhaust to ensure precise pipe diameter, routing and bend geometry
- 7-axis CNC bending for up to 98 percent roundness with minimal outer bore wear at tight radii, reducing flow disruption
- Crisscross and overlapping welding techniques for superior penetration and endurance at high-temperature zones
- Direct spot welding by mechanical arms for consistent, high-strength welds
- Accuracy tolerance targeted under 0.025 mm for consistently perfect fitment
What it feels and sounds like
With valves closed, enjoy a calm, comfortable cruise with minimal cabin resonance. Open the valves and the BMW 335i or 435i comes alive with a sharper, richer N55 note and an assertive, motorsport-inspired bark on throttle. We run this system on our own N55 builds and our customers consistently report a deeper tone, better response and excellent drivability without the harsh drone of many aftermarket systems.
Compatibility
BMW N55 engine applications:
- BMW 3 Series F30/F31 335i and 335i xDrive (2011+)
- BMW 4 Series F32 435i and 435i xDrive (2012+)
- BMW 4 Series F33 435i and 435i xDrive (2013+)
- BMW 4 Series F36 435i and 435i xDrive (2013+)
Part numbers and tailpipe options
- AP514: Dual exit with single tailpipe. Requires original bumper.
- AP514Q: Dual exit with quad tailpipes. Requires M Sport bumper.
Videos
Stone Valvetronic System installation:
BMW F30 N55 335i Stone Exhaust install:
Fitting and installation
Professional fitting recommended. Nforcd offers expert installation in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Warranty
Stone Exhaust 2 Year Warranty.
Manufacturer
Stone Exhaust
SEO-friendly search terms
BMW N55 cat back exhaust, BMW N55 cat-back exhaust, BMW 335i catback exhaust, BMW 335i valved exhaust, BMW F30 exhaust system, BMW F31 exhaust upgrade, BMW 435i catback exhaust, BMW F32 valved exhaust, BMW F33 exhaust, BMW F36 exhaust, BMW 3 Series performance exhaust, BMW 4 Series performance exhaust, BMW 335i xDrive exhaust, BMW 435i xDrive exhaust, Stone Exhaust BMW N55, Stone valvetronic exhaust, BMW N55 valvetronic cat back, BMW F30 335i exhaust UK, BMW F32 435i exhaust UK.