XYZ Racing Circuit Master Coilovers — Mazda 3 (BM-BN) (Modified Rear Integrated) 2014-2018

The BM-BN generation Mazda 3’s SKYACTIV chassis was tuned by Mazda’s own engineers for front-engine, front-drive balance, but the standard torsion-beam rear axle was never built to hold a line through a fast, off-camber apex at circuit speed. XYZ Racing’s Circuit Master coilover for the Mazda 3 (BM-BN) replaces that geometry with a modified, fully integrated rear assembly designed to keep the rear axle loaded and predictable when you’re carrying real corner speed, not cruising the school run.

This is the top-tier kit in the range, built specifically for sustained circuit lap-time work rather than fast-road comfort. Where a road-biased kit compromises to preserve ride quality, the Circuit Master is set up to hold its geometry and damping consistency across a full track session, run after run.

What this coilover does for your 2014-2018 Mazda 3

Fitted to a 2014-2018 Mazda 3, the Circuit Master’s 9720-way damping adjustment gives you the range to separate bump and rebound control at each corner, rather than compromising both to find one setting that merely survives a track surface. The 3 external adjustment knobs put that range at your fingertips trackside, so you can wind in more compression for a bumpy circuit or drop rebound for a smoother, faster layout without pulling the dampers apart. On the BM-BN’s nose-heavy SKYACTIV four-cylinder layout, tightening the front end cuts the dive and vagueness you’d otherwise feel under trail-braking into a hairpin, while the modified, integrated rear geometry keeps the back axle settled instead of skipping over kerbs and mid-corner bumps. The net result on your Mazda 3 is a car that turns in on command and stays flat through direction changes instead of rolling onto the outside tyre.

About the Circuit Master coilover

The Circuit Master sits at the top of XYZ Racing’s coilover range and is built for exactly what its name suggests: dedicated circuit and time-attack use rather than daily comfort. XYZ develops the damper valving with input from its own racing teams competing on circuits around the world, and that circuit-first brief shows up in the sheer adjustment range on offer, 9720 individual damping combinations accessed through 3 external knobs, enough to tune compression and rebound independently for almost any track surface or driving style. The internals route oil through deliberately small passages to sharpen that adjustment resolution; on rough sections of a circuit this can produce a faint noise from the damper as oil moves through the smaller orifice, which is a normal characteristic of this design rather than a fault. It’s built to be stripped down, rebuilt, and pushed hard on a circuit, not softened to also double as a comfortable commuter setup.

Fitment for the Mazda 3 (BM-BN) (2014-2018)

This Circuit Master kit is engineered specifically for the Mazda 3 (BM-BN) chassis built between 2014 and 2018, covering both the pre-facelift BM and facelift BN body. It uses a modified, fully integrated rear assembly rather than a bolt-on adaptation of the standard rear axle, so confirm your car sits within this chassis code and year range before ordering.

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Spec the damping range and ride height to match how you’ll actually use your Mazda 3, from occasional track days to a full circuit build, configure yours below.