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Stone Exhaust

Stone Exhaust Performance Catless/Decat Downpipe A224NP for BMW G-Series B46/B46D (G20 G21 G22 G23 G26 G30 G01 G02) 320i 330i 420i 430i 530i xDrive X3/X4 20i 30i - OPF/GPF Compatible

Stone Exhaust Performance Catless/Decat Downpipe A224NP for BMW G-Series B46/B46D (G20 G21 G22 G23 G26 G30 G01 G02) 320i 330i 420i 430i 530i xDrive X3/X4 20i 30i - OPF/GPF Compatible

£930.24
£1,162.80 £930.24
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BMW G‑Chassis B46 and B46D Turbo Down Pipe Upgrade - Part Number A224NP

Transform throttle response, unlock turbo efficiency and add a sharper soundtrack with this high-flow de-cat front pipe designed for BMW petrol particulate filter models. Part number A224NP is purpose-built for G‑series 3 Series, 4 Series, 5 Series and X models running the B46/B46D engine, including vehicles fitted with OPF or GPF.

Expect noticeably quicker spool, reduced back pressure and an OE-style fit that installs cleanly while delivering a more engaging drive. We have used this part extensively and our customers consistently praise the quality, weld finish and the livelier feel once fitted.

Why enthusiasts choose A224NP

  • Cat-delete design that maximises gas velocity for improved turbo performance
  • Single-section, mandrel-formed tubing for uninterrupted flow and reliability
  • Mechanised precision welding for consistent penetration and joint strength
  • Reinforced turbo flange with crisscross and overlapping welds for heat resilience
  • Integrated flex section helps control movement and reduce stress under high temperature
  • Reverse-engineered from factory parts to maintain mounting geometry
  • 7-axis CNC bending for exceptional roundness and smooth internal radii
  • Direct bolt-on fit using OEM locations for a hassle-free install

Engineered for flow and longevity

Using detailed 3D scanning and flow simulation, the pipe diameter, route and bend angles have been optimised to help the turbine work more efficiently. The one-piece layout minimises welds that can disturb flow, and the reinforced flange plus flex section are designed to cope with thermal expansion during hard use.

Fitment

Engine: BMW B46 and B46D

BMW 3 Series

  • G20 320i xDrive and rear-wheel drive / 330i xDrive and rear-wheel drive 2017+
  • G21 320i xDrive and rear-wheel drive / 330i xDrive and rear-wheel drive 2018+

BMW 4 Series

  • G22 420i xDrive and rear-wheel drive / 430i xDrive and rear-wheel drive 2020+
  • G23 420i xDrive and rear-wheel drive / 430i xDrive and rear-wheel drive 2020+
  • G26 420i xDrive and rear-wheel drive / 430i xDrive and rear-wheel drive 2020+

BMW 5 Series

  • G30 530i xDrive 2019+

BMW X Models

  • G01 X3 20i xDrive and rear-wheel drive / 30i xDrive and rear-wheel drive 2017+
  • G02 X4 20i xDrive and rear-wheel drive / 30i xDrive and rear-wheel drive 2017+

Technical highlights

  • 3D-scanned and reverse-engineered from OEM hardware for precise alignment
  • Flow analysis focused on velocity and turbine efficiency
  • 7-axis CNC bending with high roundness retention on tight radii
  • Automated spot welding for accuracy and repeatability

What our workshop thinks

We have installed this A224NP de-cat pipe on multiple B46 and B46D builds across G20, G22 and G01 platforms. Fitment is consistently OE-like, the welds are tidy and repeatable, and the driveability improvement from lower back pressure is exactly what our customers want from a premium down pipe upgrade.

Manufacturer

Stone Exhaust

Warranty

2 Year Manufacturer Warranty

Fitting

Professional installation recommended. For fitting in the UK, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Emissions and legal notice

De-cat components may not be road legal in all regions. Check local regulations and MOT requirements before purchase and installation. The buyer is responsible for ensuring compliance with applicable laws where the product is used.

Part number

A224NP

Search terms to help you find the right upgrade

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