2015-2021 Subaru STI Parts & Accessories

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  • Subaru OEM [15 - 26 WRX] WRX Logo Door Sill Plates | E101SVA001 - JDMuscleInterior AccessoriesSUBE101SVA001
    Subaru OEM

    WRX Logo Door Sill Plates

    Fits: 15-21 WRX/STI

    $11995

  • In Stock
    Cobb Subaru 6 - Speed Tall Weighted COBB Knob - White - Incl. Both Red + Blk Collars - JDMuscleShift Knobscobb213370-W
    COBB Tuning

    6-Speed Tall Weighted COBB Knob - White - Both Red + Black Collars

    Fits: 02-26 WRX, 04-21 WRX STI, 05-12 Legacy GT

    Only 12 left
    $9900

  • In Stock
    Cobb Subaru 6 - Speed Weighted COBB Knob - Black | Incl. Both Red + Blk Collars - JDMuscleNon - Categorizedcobb213360-BK
    COBB Tuning

    6-Speed Weighted Knob - Black

    Fits: 15-26 WRX MT, 04-21 WRX STI MT, 06-12 Legacy GT Spec B MT

    $9900
  • Rally Armor 15 - 21 Subaru STI & WRX Sedan Black Mud Flap BCE Logo | MF32 - BCE22 - BLK - PK - JDMuscleMudflapsralMF32-BCE22-BLK/PK
    Rally Armor

    Black Mud Flap BCE Logo

    Fits: 15-21 WRX, WRX STI Sedan

    $19050
  • CSF [08 - 21 WRX/STI] 2 - Row Subaru Aluminum Radiator | B22415 - RS - JDMuscleRadiatorsCOBB22415-RS
    CSF Racing

    CSF 2-Row Subaru Aluminum Radiator | B22415-RS

    Fits: 08-21 WRX/STI

    $39800
    Pay over time · Est. $12.44/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 Subaru EJ Turbo Blanket Black Lava - JDMuscleHeat Isolation & Heat WrapCOBB821660
    COBB Tuning

    COBB EJ Turbo Blanket - Black Lava

    Fits: 02-14 WRX, 04-21 STI, 09-10 2.5 GT, 04-13 Forester XT, 05-09 Legacy/Outback XT

    Only 7 left
    $21500
    Pay over time · Est. $6.72/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.
  • ARP 2015+ WRX/STI and 13+ BRZ Extended 5 Wheel Stud Kit - JDMuscleNon - Categorizedarp100-7729
    ARP

    Extended 5 Wheel Stud Kit

    Fits: 15-21 WRX/STI, 13-21 BRZ

    $3950
  • Up to $11 off
    In Stock
    Super Pro [15-21 WRX/STI, 14-18 FXT] Sway Bar 24mm Front Bushing
    Superpro

    Super Pro Sway Bar 24mm Front Bushing

    Fits: 15-21 WRX/STI, 14-18 FXT

    $2566$36.66 Save 30%
  • COBB Billet EFI Quick Disconnect 1/8 in NPT Tap to 5/16 in Fuel Lines - JDMuscleFuel Lines and Fittingscobb300105
    COBB Tuning

    Billet EFI Quick Disconnect 1/8 in NPT Tap to 5/16 in Fuel Lines

    Fits: 08-14 WRX, 08-21 WRX STI

    $5000

  • In Stock
    IAG Performance Unequal Length Header & Up Pipe for 2002 - 2014 WRX and 2004 - 21 WRX STI | IAG - EXT - 1000 - JDMuscleExhaust Headers and ManifoldsIAG-EXT-1000
    IAG Performance

    Unequal Length Header & Up Pipe

    Fits: 02-14 WRX, 04-21 WRX STI

    Only 1 left
    $84999
    Pay over time · Est. $26.56/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
    IAG EJ Competition Oil Pan Package for 02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT | IAG - ENG - 2202 - JDMuscleOil PansIAG-ENG-2202SLSilver
    IAG Performance

    IAG EJ Competition Oil Pan Package

    Fits: 02-14 WRX, 04-21 WRX STI, 05-09 Legacy GT, 04-13 Forester XT

    Only 1 left
    $79999
    Pay over time · Est. $25.00/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.

  • In Stock
    IAG Performance Equal Length Header & Up Pipe for Multiple Subaru Fitments | IAG - EXT - 1001 - JDMuscleExhaust Headers and ManifoldsIAG-EXT-1001
    IAG Performance

    Equal Length Header & Up Pipe for Multiple Subaru Fitments

    Only 1 left
    $89999
    Pay over time · Est. $28.12/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
    IAG [02 - 26 WRX, 04 - 21 STI] Competition Series Pitch Stop Mount | IAG - DRV - 2210 - JDMusclePitch Stop MountsIAG-DRV-2210BKBushings Not Required
    IAG Performance

    IAG Competition Series Pitch Stop Mount

    Fits: 02-26 WRX, 04-21 WRX STI

    Only 1 left
    From $12499
  • IAG 06 - 14 WRX / 04 - 21 STI Air / Oil Separator | AOS V2 Competition to V2 Street Series Conversion Kit | V2 AOS Only | IAG - ENG - 7110 - JDMuscleAir Oil SeparatorsIAG-ENG-7110
    IAG Performance

    IAG V2 Competition to Street Series AOS Conversion Kit

    Fits: 06-14 WRX, 04-21 WRX STI

    $10499
  • Up to $76 off
    Bilstein [15 - 21 WRX/STI] B6 Rear Monotube Strut Assembly - JDMuscleStruts And Shocks`bil24-249485
    Bilstein

    B6 Rear Monotube Strut Assembly

    Fits: 15-21 WRX/STI

    $15600$232.00 Save $76
  • Up to $2,251 off
    In Stock
    JDMuscle VS Style Front Lip / Extension for JDMuscle VS Style or Varis Arising II Front Bumper for [15 - 21 WRX/STI] - JDMuscleBody KitsJDM-WRX15-FB-51No I don't need a lipFiber Glass
    JDMuscle

    VS Style Front Lip / Extension for JDMuscle VS Style or Varis Arising II Front Bumper *Special Order*No Cancellation*

    Fits: 15-21 WRX/STI

    Only 3 left
    From $44900$1,800.00 Save $1,351
    Pay over time · Est. $14.03/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.

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.