Stone Exhaust Eddy Catalytic Catted Downpipe / High-Flow Sports Cat for BMW B48 2.0T (G20 320i/330i, G30/G31 520i/530i, G02 X4 20i/30i) Non-OPF/GPF | Turbo Outlet Front Pipe | Primary Catalytic Converter Upgrade | Euro 6 MOT Friendly | A216E

Stone Exhaust Eddy Catalytic Front Section for BMW B48 2.0T – G20 3 Series, G30 G31 5 Series, G02 X4 – non GPF

Give your B48-powered BMW a serious uplift in response and mid-range punch with Stone Exhaust’s eddy catalytic turbo outlet front pipe. Engineered for petrol models without a particulate filter, this performance catalyst delivers the flow your 2.0T wants while retaining emissions control. We have installed this unit on customer cars and the feedback has been outstanding – quicker spool, sharper throttle and a smoother pull to the redline with no warning lights on non GPF vehicles.

What you will feel

• Faster boost build and crisper throttle pick-up
• Stronger torque in real-world driving
• Smoother top-end power that keeps pulling
• No CEL on cars without a particulate filter
• Euro 6 compliant and MOT friendly as per manufacturer guidance

Why the Eddy Catalytic design works

Stone’s patented eddy catalyst shapes exhaust gas into a controlled vortex. At lower engine speeds it increases purification efficiency and maintains the pressure your turbo needs to light up quickly. As revs climb the flow path opens, giving top-end performance comparable to a 100-cell sports catalyst while keeping low-speed cleaning performance closer to a 400-cell unit. O2 sensor placement is optimised for accurate feedback and smooth delivery.

Proven gains

• Power increase: +7.1 PS at 5,988 rpm
• Torque increase: +20.60 Nm at 4,461 rpm

Built for performance and longevity

• SUS304 stainless steel tubing for durability and heat resistance
• 7-axis CNC mandrel bending for up to 98 percent roundness and precise flow
• CFD-style development and 3D-scanned OEM geometry for perfect routing
• Crisscross and overlapping welds at the turbo flange for strength under extreme heat
• Robotic spot welding for consistency and penetration
• Direct bolt-on with OEM-style connections – no cutting required

Compatibility

For BMW 2.0 turbo petrol B48 engines without a gasoline particulate filter:

• G20 3 Series – 320i, 330i
• G30 G31 5 Series – 520i, 530i
• G02 X4 – 20i, 30i

Replaces the factory primary catalyst section on applicable non GPF models.

Part number

Stone Exhaust Part No. A216E

Real customer results

We have fitted this performance catalyst on multiple B48 cars in-house. Owners report noticeably snappier response, stronger mid-range shove and a cleaner, more urgent top end. The fitment has been spot on thanks to Stone’s precise manufacturing.

Fitting, support and warranty

Professional installation available at MJ Modifications, Warwickshire. For a fitting quote or to book your slot, email info@mjmodifications.co.uk.

Manufacturer: Stone Exhaust. Warranty: 2 years.

Emissions and notices

Euro 6 compliant and MOT friendly as stated by the manufacturer. Check local regulations if you are outside the UK. For non GPF applications only.

Media

BMW G20 B48 330i Eddy Catalytic – sound and response

BMW G20 B48 330i Eddy Catalytic with stock cat-back

Gallery

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