Coilovers for Subaru WRX and STI

Four U.S.-market generations define coilover fitment: GD/GG (2002-2007, WRX hatchback and sedan plus STI from 2004), GR/GV (2008-2014, STI hatchback GRB through 2010 then sedan GVB/GVF through 2014, alongside the WRX), VA (2015-2021, WRX and STI share one sedan body, chassis codes VA1 for WRX and VA2 for STI), and VB (2022 onward, WRX only - Subaru has not brought the STI back on this platform). A coilover kit replaces the factory strut and spring with a threaded body and adjustable perch, and that mounting interface is generation-specific even where the bolt pattern looks similar.

On the GD-era cars (2002-2007), KW's Variant 3 is rated for 1.2-2.1 inches of front drop on the 2002-2003 WRX, 1.2-2.1 inches front and 0.9-1.8 inches rear on the 2004 STI, and 0.8-2.0 inches front with 0.4-1.5 inches rear on 2005-2007 WRX/STI - the window narrows as the factory geometry gets stiffer through that generation's run.

On the 2008-2014 GR/GV cars, Fortune Auto's 500 Series and BC Racing's BR Series cover both the GRB hatchback and the later GVB/GVF sedan under separate part numbers; published drop figures vary by series, so check the listing for your exact body style. The 2015-2021 VA cars narrow KW's Variant 3 window to 0.6-1.4 inches front and 0.2-1.4 inches rear, reflecting the stiffer VA chassis, while Godspeed's MonoSS for the same VA2 STI runs a 10 kg/mm front and 8 kg/mm rear spring rate on an adjustable perch. The 2022+ VB WRX has its own part numbers across every brand - Tein's Flex Z for the VB is a distinct kit from the VA-generation Street Basis Z.

Lowering a WRX or STI moves the control arms and strut angle out of their designed range, which shows up as added negative camber and reduced bump travel before fenders or wiring harnesses get close to the tire. Forum consensus among long-time NASIOC owners puts a comfortable daily-driver drop around 0.5 to 1.5 inches; pushing toward the top of a kit's adjustment range, close to 2 inches on GD or GR-era kits, usually means budgeting for camber bolts or camber plates and an alignment shop that understands lowered AWD Subarus, not just a stock-spec alignment.

Because ride height interacts with spring preload and damper setting, re-check corner weights and alignment after the car has settled for a few hundred miles rather than immediately after install.

Entry-level twin-tube kits, such as Godspeed MonoSS or Tein Street Basis Z, cover ride-height adjustment at a lower price point and suit a WRX that is mostly driven on the street. Mid-tier monotube kits, such as BC Racing BR/DS or Fortune Auto 500, add independent damping adjustment, which matters more once an STI sees track days or autocross. Installation is a standard strut swap on all four generations, though GD and GR-era cars will often need new strut mounts and sway bar end links at the same time given the age of the factory hardware.