AST x MOTON Coilovers — Subaru WRX & STI

Why AST x MOTON Suits the WRX / STI

The WRX and STI have been Australia's most-modified performance cars for over two decades, and the suspension question on this platform follows a familiar pattern: factory dampers are tuned for road compliance, not track work, and they wear out hard under any kind of sustained spirited driving. Every owner who keeps the car long enough eventually replaces them.

The MacPherson strut front and multi-link rear architecture has two specific challenges. First, like the GR86, MacPherson struts have poor camber gain — the wheel actually loses negative camber as the suspension compresses, which is the opposite of what you want in a corner. Combined with the WRX/STI's near-factory front camber, this causes heavy front tyre shoulder wear under any kind of trail-braking or cornering load. The fix is camber-adjustable front top mounts.

Second, the AWD system loads the front brakes heavily during trail braking — front camber matters for both turn-in grip and front tyre longevity. Get the camber right and the car finds another level of front-end response.

That's the AST x MOTON argument on this platform: every kit ships with camber-adjustable front tops as standard. AST 5100 Competition, 5200, 5300, and the full MOTON range — all of them. You're not picking a coilover and bolting on aftermarket camber plates as an afterthought; the geometry comes with the kit. Add to that monotube construction, Dutch-engineered valving, and full rebuildability — and you have suspension that can be re-tuned and serviced over the life of a build, instead of replaced.

The AST x MOTON Range for the WRX / STI

AST currently has a dedicated SKU live for the GE/GH/GR/GV chassis (5x100 PCD) at $5,375 — covering the late-2000s through 2014 platforms. The full AST tier ladder, plus the complete MOTON range, is available made-to-order for VA/VAB (2015–2021) and VB (2022+) platforms:

• AST 5100 Competition (Inverted): The flagship single-adjust setup. Inverted strut for lateral load handling, camber-adjustable front tops, rebound damping. The benchmark fast-road-plus-trackday choice.
• AST 5200 Series (2-Way): Independent rebound and compression with remote reservoirs. Where serious WRX/STI club-day and HPDE builds tend to land — separating compression from rebound damping is genuinely useful on AWD platforms where weight transfer is significant.
• AST 5300 Series (3-Way): Rebound, low-speed compression, and high-speed compression each on its own knob. The top of the AST range, suited to time attack and tarmac competition.
• MOTON 1-Way Clubsport: Non-inverted monotube, 1-way 12-position rebound, camber-adjustable front tops. The motorsport-tier entry.
• MOTON 2-Way Clubsport: Inverted, monotube, independent rebound and compression with remote reservoirs. 15-step damping adjustment. Strong choice for serious club racing and tarmac rally.
• MOTON 3-Way Motorsport: Inverted, monotube, elevated top guide and helper piston for low-friction operation. Independent rebound, low-speed compression, and high-speed compression. The damper spec for WRX/STI programmes running aero, slicks, or full motorsport calibration.

Spring rates and valving are spec'd to your build at the order stage — talk to us before ordering and we'll match the kit to street, club, or competition use.

Camber Setup — What the WRX / STI Actually Needs

Once you've fitted AST or MOTON, you have the geometry range to actually tune camber. From our camber setup guide:

• Street: -1.5° to -2.0° front, -1.5° rear. Zero front toe, slight rear toe-in.
• Track day: -2.5° to -3.0° front, -2.0° rear.
• Dedicated track / time attack: -3.0° to -3.5° front, -2.0° to -2.5° rear. Pair AST/MOTON tops with Hardrace adjustable rear arms for matched rear adjustment.

Two more reads worth your time before ordering:

• 1-Way vs 2-Way vs 3-Way Adjustable Damping Explained — what each adjuster controls and where the AST 5100, 5200, and 5300 sit.
• How to Adjust AST & MOTON Coilovers — the practical guide to where the knobs are and how to develop a baseline.

After installation, a full four-wheel alignment is essential. On the WRX/STI specifically, take advantage of the new front camber adjustment range to dial in static camber suited to your tyre and driving plan — the AWD platform rewards balanced front-rear adjustment.

Pair With Your WRX / STI Build

The WRX/STI ecosystem is the deepest aftermarket catalogue we stock — partly because the platform spans 25+ years of OEM evolution, and partly because the aftermarket has had time to develop solutions for every wear point and weakness. Worth looking at alongside your coilover order:

• Big Brake Kits — STI Brembo: Brembo Pista Front BBK 355×32mm (SKU BREMBO-STI-PISTA-355-32-PG, $7,699) for GC/GD/GR/VA STI, or Alcon TA6+ Front BBK 355×32mm (SKU ALCON-STI-TA6-355-32-AL, from $4,390) — both engineered for the STI front-end.
• Big Brake Kits — VB WRX: Alcon TA6+ Front BBK 355×32mm (SKU ALCON-VB-TA6-355-32-AL, from $4,390) — purpose-built for the 2022+ WRX VB.
• 2-Piece Rotor Upgrades: DIXCEL 2-Piece Front Brake Discs (Brembo 4-Pot, 326×30mm) for GDB/GR/GV/VAB STI, or Paragon Front 1-Piece Rotors (326×30mm, $579) for the same fitments.
• Brake Pads — VA/VAB STI: DIXCEL Front Pads (Brembo 4-pot) and DIXCEL Rear Pads (Brembo 2-pot) across the full compound range — see the DIXCEL compound guide.
• Brake Rotors — VA/VB Brembo: DIXCEL 340×30mm Front Rotors and 326×20mm Rear Rotors — fits VA STI, VB Club Spec/tS Spec B, and VB owners running OEM STI Brembo caliper swaps.
• Brake Pads — Track: Endless MX72 Plus for street + track all-rounder use, or DIXCEL Z Type for trackday-focused setups.
• Exhaust: Tomei EXPREME Ti for the full GDB/GRB/GRF/GVB/GVF/VAB range — the benchmark titanium muffler, plus EXPREME Stainless Manifolds in equal-length, unequal-length, and twin-scroll variants.
• Downpipe: KORSH Catted or KORSH Catless Downpipe — fits WRX (GE/GH/GR/GV) and STI (GR/GV/VA), Forester XT, and Liberty GT.
• Tuning: COBB Accessport V3 (2015–2021 WRX/STI) or COBB Accessport V3 (2022+ VB WRX) — the prerequisite for any meaningful tune. Read our TGV Deletes Explained blog if you're heading toward higher boost or E85.
• Engine reliability: HKS Fine Tune Timing Belt for EJ20/EJ25 — essential for any high-RPM build on the older platforms.

Frequently Asked Questions

Which AST or MOTON series is right for my WRX / STI?

For a street-primary car with occasional trackdays, AST 5100 Competition is the benchmark. For a regular HPDE or club-day car, AST 5200 2-way is where most serious WRX/STI builds land. For tarmac rally, time attack, or competition-spec builds with aero, MOTON 2-way or 3-way is the correct spec.

Is the AST kit available for VA/VAB and VB WRX?

Yes. The dedicated SKU on-site covers GE/GH/GR/GV (the 5x100 generation), but the full AST and MOTON range is available made-to-order for VA/VAB and VB chassis at the Dutch facility. Confirm your variant when ordering and we'll spec the kit correctly — spring rates and valving differ between VA STI Brembo and VB single-piston factory configurations, so getting the platform right matters.

Why does the WRX / STI specifically benefit from camber-adjustable top mounts?

Two reasons. First, the MacPherson strut front geometry has poor camber gain — under cornering load, the wheel loses negative camber rather than gaining it. Second, the AWD system loads the front brakes heavily under trail braking, which means front camber affects both turn-in grip and front tyre wear. Camber-adjustable top mounts let you dial in -2.5° to -3.0°+ static front camber to compensate. AST and MOTON include these as standard on every kit for the platform.

Does the kit differ between WRX and STI?

Yes. The WRX and STI run different spring rates, different damper valving, and within the same chassis generation (e.g. VA WRX vs VAB STI) often have different OEM strut diameters. AST and MOTON build platform-specific kits — confirm both the chassis code and the trim (WRX vs STI) before ordering.

Are AST and MOTON coilovers rebuildable?

Yes. Every damper is fully serviceable. Seals replaced, oil refreshed, valving respec'd — for a new spring rate, aero package, or shift from street to competition use. A well-maintained set lasts decades rather than being a consumable, which matters on a platform that owners typically keep and modify over many years.

What's the lead time?

AST and MOTON are built to order at the Dutch facility. Typical lead time is around four weeks for the standard AST range; MOTON and custom-spec AST builds can run longer. If you're targeting a specific event, talk to us before ordering — we can sometimes expedite a build, and occasionally there's stock available.

Do I need a wheel alignment after fitting?

Yes, always. Any ride-height change alters camber, toe, and caster — so a full four-wheel alignment is essential. On the WRX/STI specifically, take advantage of the new camber adjustment range to dial in front camber suited to your tyre and driving plan, and pair with Hardrace rear arms if you're targeting -3.0°+ for matched rear adjustment.