Stone Exhaust BMW N20 2.0T Catless Downpipe – Decat/De-Cat & Primary Cat Delete Front Pipe, High-Flow Turbo Outlet Straight Pipe – X1 E84, Z4 E89, X3 F25 20i/28i xDrive, X4 F26 20i/28i xDrive – Stage 2 Hardware – Part A206XP

High-flow de-cat front pipe for BMW N20 2.0T – X1 E84, Z4 E89, X3 F25 20i 28i xDrive, X4 F26 20i 28i xDrive – Part A206XP

Transform the way your N20-powered BMW breathes. This Stone Exhaust straight-through turbo down pipe deletes the primary catalyst to minimise restriction, speed up turbo spool and unlock a sharper, more responsive drive with a deeper, motorsport-inspired soundtrack. If you are building a fast-road or track-only BMW and want a proven exhaust upgrade that fits like factory and flows like a race part, this is the front section to choose.

We have fitted and run this Stone Exhaust de-cat on our own cars and for many customers. Feedback is consistently positive on fitment, quality and the immediate improvement in throttle response. For drivers searching phrases like BMW N20 performance down pipe, BMW 2.0 turbo decat, X3 F25 20i upgrade pipe, X4 F26 28i straight pipe, Z4 E89 28i turbo outlet, X1 E84 20i front pipe, this A206XP unit is the enthusiast favourite.

Why this race down pipe stands out

• Engineered for BMW N20 2.0 turbo petrol – X1 E84 20i 28i, Z4 E89 20i 28i, X3 F25 20i 28i including xDrive, X4 F26 20i 28i xDrive.
• Computational flow analysis and 3D development focused on velocity, bend radius and routing for maximum gas speed and minimal back pressure.
• One-piece mandrel bends reduce unnecessary welds inside the tube, keeping the bore smooth for superior flow.
• Integrated flex section manages thermal expansion to help prevent cracking during extreme heat cycles.
• Turbo flange reinforced with crisscross and overlapping weld techniques for strength under 800 to 1100 degrees Celsius thermal stress.
• Robotic precision welding for consistent penetration and durability that looks as good as it performs.
• 7-axis CNC mandrel bending maintains up to 98 percent roundness, even through tight radii, for uninterrupted flow.
• Reverse engineered from the OE part with 3D scanning for a true factory-like fit using original mounting points.
• Direct replacement front pipe – no cutting required, installs with standard hardware positions.

Designed to deliver response and sound

Stone Exhaust invests heavily in R&D, combining 3D scanning of the OEM path with flow velocity software and thermal pressure simulation. The result is a precisely formed primary cat delete that reduces restriction, promotes quicker turbocharger response and enhances the exhaust tone without compromising fitment. Accuracy tolerances are under 0.025 mm, with exceptional roundness and a reinforced turbo connection designed to endure repeated heat cycles.

Fitment and compatibility

Engine: BMW N20 2.0 turbo petrol

BMW X Series

• E84 X1 20i, 28i
• F25 X3 20i, 28i, including xDrive
• F26 X4 20i xDrive, 28i xDrive

BMW Z Series

• E89 Z4 20i, 28i

Part number

A206XP

Manufacturer

Stone Exhaust

Warranty

Stone Exhaust 2-year warranty.

Professional installation

Want a seamless fit and finish first time. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

SEO-friendly search phrases customers use

BMW N20 de-cat front pipe, BMW 2.0T turbo down pipe upgrade, BMW X1 E84 20i 28i exhaust mod, BMW Z4 E89 20i 28i race down pipe, BMW X3 F25 20i 28i xDrive turbo outlet, BMW X4 F26 20i 28i xDrive de-cat pipe, straight-through down pipe, primary cat delete, high flow front section, track-only exhaust, stage 2 hardware N20, UK BMW tuning parts, performance exhaust front pipe, A206XP Stone Exhaust.

Important notice

This de-cat product is intended for off-road, closed-course, track or motorsport use only where permitted. Please check local laws and regulations before purchase and installation.

R&D images

3D scanning and reverse engineering

7-axis CNC bending

Precision welding

Video