Stone Exhaust BMW B46 G20 F22 F30 F32 F34 Eddy Catalytic Downpipe (Inc. 230i, 330i, 330i xDrive GT, 430i, 520i & 530i / Non OPF Model)

High‑flow catted front pipe for BMW B46 2.0 turbo models. More response, more flow, emissions friendly.

Unlock extra performance and crisp throttle response from your 2.0 TwinPower Turbo with Stone’s vortex‑style sports catalyst downpipe for non‑OPF cars. This advanced swirl‑cat design accelerates exhaust gas velocity, cleans efficiently at low rpm and flows like a performance cat at higher load. The result is stronger mid‑range pull, quicker spool and a cleaner, sharper driving feel without engine warning lights.

We run this hardware on our own and customer vehicles and it has been superb. Fitment is spot on, drivability is improved and feedback has been consistently positive.

Why this performance downpipe stands out

• Vortex catalyst core. Swirl flow promotes excellent emissions at light load while maintaining high flow when you push on.
• CEL free by design. Optimised O2 sensor placement for correct lambda readings and no EML on compatible vehicles.
• Euro 6 compliant and MOT friendly for non‑OPF applications.
• Premium SUS304 T304 stainless steel resists corrosion and heat cycling.
• 7‑axis CNC mandrel bends for smooth, consistent radius and minimal turbulence.
• Reinforced turbo outlet flange with cross‑overlap welds for durability at extreme temperatures.
• Direct bolt‑on using factory mounting points. No cutting. No additional fabrication.
• Precisely engineered from 3D scans of OE parts for true OEM‑style fit.

Engineering you can trust

Stone reverse‑engineers each application with full 3D scanning of the factory system, then models gas dynamics, pressure zones and heat distribution to optimise diameter and routing. The pipework is formed on a 7‑axis CNC bender to maintain roundness through tight radii, then finished with TIG and direct spot welds for strength and consistency. The turbo flange area benefits from criss‑cross weld penetration that stands up to 800 to 1100°C temperature cycles.

Fitment guide. BMW 2.0 petrol B46 non‑OPF

Designed for vehicles without a petrol particulate filter PPF OPF. B46 engine family only.

• 2 Series
  • F22 230i and 230i xDrive including LCI
  • F23 230i Convertible and 230i xDrive including LCI
• 3 Series
  • F30 LCI 330i
  • F31 LCI 330i xDrive Touring
  • F34 GT LCI 330i xDrive Gran Turismo
• 4 Series
  • F32 LCI 430i and 430i xDrive
  • F33 LCI 420i and 430i including xDrive
  • F36 LCI 420i 420i xDrive and 430i Gran Coupe
• 5 Series
  • G30 520i
  • G30 530i and 530i xDrive
• X Models
  • G01 X3 20i xDrive 2017–2018 and X3 30i xDrive 2016–2018
  • G02 X4 20i xDrive 2017–2019 and X4 30i xDrive 2017–2019

Part number

A224E

Installation

Direct replacement for the factory turbo outlet pipe on compatible non‑OPF cars. For professional fitting, contact MJ Modifications in Warwickshire for a quote at info@mjmodifications.co.uk.

Warranty

Backed by a 2‑year manufacturer warranty.

Important notes

• For non‑OPF PPF vehicles only.
• Please check local regulations before modifying your exhaust system.

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