Stone Exhaust A238P Catless Downpipe / Decat Front Pipe for BMW 218i 318i B38 1.5T (F22 F23 F30 F31) - High-Flow Cat Delete Turbo Outlet, Straight-Through Race/Track Pipe, OEM-Fit F2x F3x 2 Series 3 Series

Stone Exhaust A238P Decat Front Pipe for BMW B38 1.5 Turbo 218i and 318i

Unlock immediate response and a harder-hitting soundtrack with this free-flow turbo outlet from Stone Exhaust. Designed around the BMW B38 three-cylinder 1.5 turbo found in the 218i and 318i F-series platforms, this cat delete front section replaces the restrictive catalyst with a high-velocity, straight-through design for faster spool, stronger mid-range pull and a sharper, sportier tone.

We have fitted this upgrade at MJ Modifications and customer feedback has been consistently positive on fit, finish and the way the car drives and sounds afterwards. If you are chasing a simple, proven flow improvement on a mapped or stock car, this motorsport-only decat pipe delivers.

Why enthusiasts choose this upgrade

• Free-flow race pipe for the B38 1.5-litre turbo triple to reduce back pressure and improve turbine efficiency
• OEM-fit replacement section for F2x and F3x chassis that enhances throttle response and turbo spool
• Track-use cat delete that uncorks a deeper, more purposeful exhaust note
• Engineering-led construction aimed at durability under extreme heat cycles
• Designed to complement further tuning such as ECU calibration and intake modifications

Engineering highlights

• Unique flex section design to help protect against stress and cracking when temperatures soar
• Crisscross welding that reinforces the turbo flange for long-term reliability
• One-piece mandrel-bent tube for optimal internal smoothness and gas speed
• Precision machine welding by mechanical welding arms for consistent, repeatable quality
• In-house R&D with 3D scanning and reverse engineering of the factory component
• 3D flow velocity simulation to optimise gas direction, thermal control and pressure zones
• 7-axis CNC bending to maintain exceptional roundness and accuracy
• Integrally moulded pipework with accuracy error under 0.025 mm
• 100% OEM fitment for a straightforward install

Vehicle applications

BMW 2 Series

• F22 218i 2012 to 2017 and F22 LCI 218i 2016 to 2019
• F23 218i 2014 to 2017 and F23 LCI 218i 2016 to 2019

BMW 3 Series

• F30 LCI 318i 2015 onwards
• F31 LCI 318i 2015 onwards

Real-world results

From our workshop installs, the A238P fits like a factory part and immediately frees up the B38’s character. Expect a crisper pedal, faster-reacting turbo and a richer, more engaging soundtrack on throttle. Enthusiasts pairing this with a tune have reported a notably livelier drive.

Installation and support

Professional installation recommended. For fitting, speak to the BMW specialists at MJ Modifications in Warwickshire. Request a fitting quote via info@mjmodifications.co.uk.

Warranty

Stone Exhaust 2 Year Warranty

Part number

A238P

Important notes

This is a catless component intended for off-road and track use only where local laws permit. It is the customer’s responsibility to ensure compliance with applicable regulations.

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