How reliable is this fitment answer?

Confidence: Limited (1 of 3). Forum, Reddit or anecdotal report, or ambiguous/partial detail. Treat as a lead to research. Based on 2 cited source(s), last verified 2026-10-26.

Will OEM 2008-17 STI Brembo 4-piston front calipers (326 mm rotor) fit a Subaru WRX and STI (GE/GH/GR/GV, 2008-2014)?

Q: Will OEM 2008-17 STI Brembo 4-piston front calipers (326 mm rotor) fit a Subaru WRX and STI (GE/GH/GR/GV, 2008-2014)?

Yes, with extra parts or work. Fits with the right rotors, per one retailer. The STI's own front brake (4-piston Brembo on a 326 x 30 mm rotor, '17-inch type' in the 2012 and 2014 manuals) bolts to a 2008-14 WRX front knuckle, but STI rotors are drilled 5x114.3 from 2005 on, so the WRX needs STI-size front rotors drilled 5x100. Use STI pads, and wheels of at least 17 inches that clear the calipers; the factory WRX 17x8 needs a spacer on the VA (F-va-06), so test-fit on these cars too.

Added 2026-10-26 · Updated 2026-10-26

Short answer: Yes, with extra parts or work Limited

Verdict:Fits with mods Limited confidence (1 of 3) · 2 sources

Yes, with extra parts or work: Fits with the right rotors, per one retailer.

Years: 2008-2014 · Applies to: WRX (standard on STI) · 2 sources · Last verified 2026-10-26

Safety-critical part. Manufacturer sources are cited, but they disagree or are incomplete for this fitment, so this entry is held below "Confirmed". Have the work done or checked by a qualified professional and confirm figures and part numbers against the service manual or the manufacturer.

Part	OEM 2008-17 STI Brembo 4-piston front calipers (326 mm rotor)
Vehicle	Subaru WRX and STI (GE/GH/GR/GV, 2008-2014)
Years	2008-2014
Trim / condition	WRX (standard on STI)
Verdict	Fits with mods Fits with extra parts or work
Confidence	Limited 1 of 3 — Forum, Reddit or anecdotal report, or ambiguous/partial detail. Treat as a lead to research.
Last verified	2026-10-26 (date the cited sources were last read)

Details

Fits with the right rotors, per one retailer. The STI's own front brake (4-piston Brembo on a 326 x 30 mm rotor, '17-inch type' in the 2012 and 2014 manuals) bolts to a 2008-14 WRX front knuckle, but STI rotors are drilled 5x114.3 from 2005 on, so the WRX needs STI-size front rotors drilled 5x100. Use STI pads, and wheels of at least 17 inches that clear the calipers; the factory WRX 17x8 needs a spacer on the VA (F-va-06), so test-fit on these cars too.

Specs

pistons mm: 40 x2 + 46 x2
rotor mm: 326 x 30 ventilated
wheel class: 17-inch type
pad mm: 131.8 x 60.5 x 8.9 (2012 manual)

Related build entries

Fit STI Brembos to a 2008-14 WRX

Other brakes fitment for the GE/GH/GR/GV

OEM 2008-14 WRX front brake (floating caliper, 294 mm rotor) — Specification Factory spec
OEM 2008-17 STI Brembo 2-piston rear calipers (316 mm rotor) — Fits with extra parts or work Fits with mods
OEM 2018-19 STI Brembo 6-piston front calipers (340 mm rotor) — Fits with extra parts or work Fits with mods
2004-2007 STI front Brembo calipers — Fits with extra parts or work Fits with mods
2004-2007 STI rear Brembo calipers — Fits with extra parts or work Fits with mods

This part on other generations

Subaru WRX and STI (VA, 2015-2021) — Fits with extra parts or work Fits with mods
Subaru WRX (GD/GG, 2002-2007) — Fits with extra parts or work Fits with mods

More for this car

All Subaru WRX and STI (GE/GH/GR/GV, 2008-2014) fitment answers · GE/GH/GR/GV common problems
Newsletter archive: past issues with every new and corrected entry

Sources

STi Brembo Brakes — FastWRX.com (Mach V Motorsports, Subaru parts retailer) (vendor article; read 2026-10-26; full page read)
Any STI front Brembo bolts to a 2008+ WRX with 5x100-drilled STI front rotors; needs a 17-inch or larger wheel.
2012MY Impreza WRX & STI service manual G1130BE (book 12STI_US, 2011-08-23) — Subaru (Fuji Heavy Industries) (mfr spec; read 2026-10-26; full page read)
STI front: opposed 4-piston, 326 x 30, 17-inch type.

Summaries are in our own words. Fitment is not guaranteed — disclaimer.

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