2015-2021 Subaru STI Parts & Accessories

3344 products

Clear all

  • In Stock
    JDMuscle [15 - 21 WRX/STI] Gloss Black / Paint Matched Rear Diffuser V1 - JDMuscleDiffusers and Vortex GeneratorsJDM-WRX15-DIFFGBGLOSS BLACK
    +9
    JDMuscle

    Gloss Black / Paint Matched Rear Diffuser V1

    Fits: 15-21 WRX/STI

    Only 10 left
    $30900
    Pay over time · Est. $9.66/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • Up to $115.43 off
    In Stock
    Goodridge [15 - 17 STI] Brake Lines | 24225 - JDMuscleBrake Linesgri24225
    Goodridge

    G-Stop Brake Line Kit

    Fits: 15-17 WRX STI

    Only 20 left
    $14500$260.43 Save $115.43

  • In Stock
    COBB 04 - 21 STI Stage 1 Drivetrain Package | 215X01 - JDMuscleShifter and Bushing Comboscobb215X01
    COBB Tuning

    Stage 1 Drivetrain Package

    Fits: 04-21 WRX STI 6MT

    $28500
    Pay over time · Est. $8.91/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.

  • In Stock
    COBB [15 - 18 STI] SF Black Intake and Airbox Package - Black/Blue | 715315 - JDMuscleIntakescobb715315-BLBlue
    COBB Tuning

    SF Black Intake and Airbox Package - Black/Blue

    Fits: 15-18 WRX STI

    $54000
    Pay over time · Est. $16.88/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • Up to $8.20 off
    In Stock
    Perrin [13-21 BRZ/FR-S/86, 22-26 BRZ/GR86] Drift Button Black - JDMuscleKnobs and ButtonsperPSP-INR-353BK
    Perrin Performance

    Perrin Drift Button - Black

    Fits: 08-21 WRX/STI, 13-16 FR-S, 13-26 BRZ, 17-20 86, 22-26 GR86

    Black Friday Deal: 20% Off Ends 1/4
    $3280$41.00 Save 20%
  • Up to $27 off
    In Stock
    Radium Engineering [08-21 WRX/STI, 05-09 LGT/OBXT] V2 Fuel Pump Hanger for use w/ Walbro 450LPH | F90000267/274/285 Pumps - JDMuscleFuel Pumps and Accessoriesrad20-0782-00
    Radium Engineering

    V2 Fuel Pump Hanger for use w/ Walbro 450LPH F90000267/274/285 Pumps

    Fits: 08-21 WRX/WRX STI, 05-09 Legacy GT/Outback XT

    Only 12 left
    $51295$539.95 Save $27
    Pay over time · Est. $16.03/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • OLM [15-21 WRX/STI] High Point Duckbill Spoiler - Carbon Fiber - JDMuscleSpoilers and WingsOLMA.70026.1-CF
    OLM

    High Point Duckbill Spoiler - Carbon Fiber

    Fits: 15-21 WRX/STI

    $47760
  • BC Racing BR Series Extreme Low Coilover Kit WRX/STI 15-21 - JDMuscleCoiloversF-25E-BR
    BC Racing

    BR Series Extreme Low Coilover Kit

    Fits: 15-21 WRX/STI

    $1,70800
    Pay over time · Est. $53.38/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.

  • In Stock
    Rally Armor [15-21 WRX/STI] Black UR Mud Flap w/Green Logo - JDMuscleMudflapsralMF32-UR-BLK/CGN
    Rally Armor

    Black UR Mud Flap w/ Green Logo

    Fits: 15-21 WRX/STI

    Only 9 left
    $19050

  • In Stock
    Grimmspeed [08-21 STI] Electronic Boost Control Solenoid Cover Red - JDMuscleBoost Control Solenoid Coversgrm112000.1
    GrimmSpeed

    Electronic Boost Control Cover - Red

    Fits: 08-21 WRX STI

    $8700
  • Up to $71.60 off
    Perrin [18-21 STI] Hi-Power Cold Air Intake Neon Yellow | PSP-INT-326NY - JDMuscleIntakesperPSP-INT-326NY
    Perrin Performance

    Perrin Hi-Power Cold Air Intake — Neon Yellow

    Fits: 18-21 WRX STI

    Black Friday Deal: 20% Off Ends 1/4
    $28640$358.00 Save $71.60
    Pay over time · Est. $8.95/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • Up to $186 off
    In Stock
    Perrin [08-21 STI] Top Mount Intercooler Black - JDMuscleIntercoolersperPSP-ITR-302BK
    Perrin Performance

    Perrin Top Mount Intercooler Black

    Fits: 08-21 WRX STI

    Black Friday Deal: 20% Off Ends 1/4
    $74400$930.00 Save $186
    Pay over time · Est. $23.25/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.

  • In Stock
    Power Stop [05-17 STI] Z26 Street Warrior Brake Kit - Front | K131-26 - JDMuscleBrake KitspsbK131-26
    PowerStop

    Power Stop Z26 Street Warrior Brake Kit - Front

    Fits: 05-17 WRX STI

    Only 4 left
    $30857
    Pay over time · Est. $9.64/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • Up to $52.60 off
    In Stock
    NGK Iridium Spark Plugs Heat Range 7 - Multiple Fitments - JDMuscleSpark Plugsngk2309
    NGK

    Iridium Spark Plugs Heat Range 7 - Multiple Fitments

    $3800$90.60 Save 58%
  • JDMuscle [15-21 WRX/STI] VS Style Wide Body Kit *Special Order*No Refunds* - JDMuscleBody KitsJDM-WRX15-VRWB-1DefaultDefaultDefault
    JDMuscle

    VS Style Wide Body Kit *Special Order*No Refunds*

    Fits: 15-21 WRX/STI

    From $6,40000
    Pay over time · Est. $200.00/payment
    ⓘ

    Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.
  • Up to $6.44 off
    In Stock
    Sticker Fab 15-21 WRX/STI 3D Carbon Low Profile OEM Spoiler Protector Accent with Logo
    Sticker Fab

    StickerFab 3D Carbon Low Profile OEM Spoiler Protector Accent with Logo

    Fits: 15-21 WRX/STI

    From $1000$16.44 Save 39%

The VA-chassis STI is one of the most modified platforms in the Subaru universe, and for good reason. The EJ257 responds to upgrades, the chassis rewards better suspension, and the aftermarket support is extensive. This collection brings together STI aftermarket parts for every corner of your 2015-2021 build from top brands Grimmspeed, Perrin Performance, Cobb Tuning, and more. 

  • Engine and drivetrain: intakes, turbo upgrades, exhaust systems, intercoolers, clutches and short shifters. 
  • Suspension and handling: coilovers, springs, sway bars, bushings and chassis bracing. Wheels and brakes to put it all to the ground. 
  • Let’s not forget the cosmetic upgrades: carbon fiber, lip kits, spoilers, lighting and interior accessories from JDMuscle.

Every product listing in our STI aftermarket parts collection has verified information, so you know what fits before you order.

FAQs

Do 2015 STI aftermarket parts fit all VA-generation models?

Many do: the 2015-2021 STI shares its core platform throughout. Engine, drivetrain, and suspension parts usually cross over without issue. Exterior components are the exception, since the 2018 facelift changed several body panels. Always check the fitment info on the listing.

What should I upgrade first on my STI?

Intake, cat-back exhaust, and a professional tune give you the most noticeable gains for the money and lay a foundation for everything after. If handling is your priority, coilovers or springs plus sway bars come first instead of STI aftermarket parts.

Will these parts affect my warranty?

STI aftermarket parts can affect coverage on related components, and most 2015-2021 STIs are outside factory warranty anyway. Check with your dealer if warranty status matters to your build.

Why buy STI aftermarket parts from JDMuscle?

We're a family business run by actual Subaru people. We mod our own cars and handle our own customer service. Curated brands, competitive pricing with our price match guarantee, easy returns, and same-day shipping (Saturdays included). Free shipping over $199 to the continental 48 states.