2015-2021 Subaru STI Parts & Accessories

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  • In Stock
    COBB [15 - 21 STI] Fuel Pressure Sensor Kit - JDMuscleFuel Pressure Sensorcobb315650
    COBB Tuning

    Fuel Pressure Sensor Kit

    Fits: 08-21 WRX STI

    $27500
    Pay over time · Est. $8.59/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.
  • Subaru OEM Aluminum Wheel Lug Nut Most Subaru Models | 28171AJ001 - JDMuscleLug Nuts28171AJ001
    Subaru OEM

    Wheel Lug Nut

    Fits: Most Subaru Models

    $365

  • In Stock
    IAG Performance 02 - 14 WRX / 04 - 21 STI / 04 - 13 FXT / 05 - 09 LGT 550 Series EJ25 Short Block | IAG - ENG - S550 - JDMuscleFabricationIAG-ENG-S550
    IAG Performance

    IAG 550 Series EJ25 Short Block

    Fits: 02-14 WRX, 04-21 WRX STI, 04-13 FXT, 05-09 LGT

    Only 1 left
    $4,49900
    Pay over time · Est. $140.59/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 $12 off
    In Stock
    Turbo XS WRX/STi 3in Downpipe to OEM Cat - Back Adapter w/OEM Donut Gasket | ADA - 3DP - OEMCB - 2 - JDMuscleExhaust Gaskets and HardwaretxsADA-3DP-OEMCB-2
    Turbo XS

    3in Downpipe to OEM Cat-Back Adapter w/OEM Donut Gasket

    Fits: WRX/STI

    $6100$73.00 Save 16%

  • In Stock
    Cobb 04 - 20 STI 6MT Stage 2+ Drivetrain Package w/Weighted Black Knob + Race Red Lockout - JDMuscleShifter and Bushing Comboscobb215X02P-WK-BK-RDBK
    COBB Tuning

    Stage 2+ Drivetrain Package - Weighted Black Knob + Race Red Lockout

    Fits: 04-21 WRX STI 6MT

    Only 10 left
    $49000
    Pay over time · Est. $15.31/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
    Grimmspeed Red Reservoir Cap Set Most Subaru Models | 120070 - JDMuscleDress Up Capsgrm120070
    GrimmSpeed

    Engine Bay Dress-Up Caps - Red

    Fits: 02-21 WRX/WRX STI, 04-08 Forester XT, 05-12 Legacy GT/Outback XT

    Only 1 left
    $9400
  • Verus Engineering [15 - 21 WRX/STI] Rear Spat Kit | A0204A - JDMuscleRear LipsVERA0204A
    Verus Engineering

    Rear Spat Kit

    Fits: 15-21 WRX/STI

    $14520
  • Up to $21 off
    In Stock
    Perrin 18 - 21 WRX/STI / 13 - 22 BRZ / 13 - 16 FRS / 17 - 21 GT86 Front Tow Hook Neon Yellow | PSP - BDY - 235NY - JDMuscleTow HooksperPSP-BDY-235NY
    Perrin Performance

    Perrin Front Tow Hook - Neon Yellow

    Fits: 18-21 WRX/STI, 13-20 BRZ, 13-16 FR-S, 17-20 86

    Only 8 left
    Black Friday Deal: 20% Off Ends 1/4
    $8400$105.00 Save $21
  • Up to $39.09 off
    In Stock
    Whiteline [08 - 21 WRX/STI, 10 - 13 LGT, 09 - 13 FXT] Rear Sway Bar 24mm Adjustable | BSR49XXZ - JDMuscleSway BarswhlBSR49XXZ
    Whiteline

    Rear Sway Bar 24mm Adjustable

    Fits: 08-21 WRX/STI, 10-13 Legacy GT, 09-13 Forester XT

    $35179$390.88 Save $39.09
    Pay over time · Est. $10.99/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 $185 off
    XForce [11 - 21 WRX/STI Sedan] Varex Valved Cat Back Exhaust System | ESSWRX14VKCS - JDMuscleCat Back Exhaust SystemESSWRX14VKCS
    XForce

    Varex Valved Cat-Back Exhaust System

    Fits: 11-21 WRX/STI Sedan

    $1,66500$1,850.00 Save $185
    Pay over time · Est. $52.03/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.
  • Up to $10.33 off
    In Stock
    SuperPro [15 - 25 WRX, 15 - 21 STI, 14 - 17 FXT] Rear Differential Centre Support Void Filler | SPF4297K - JDMuscleTransmission and Differential BushingssprSPF4297K
    Superpro

    Rear Differential Centre Support Void Filler

    Fits: 15-25 WRX, 15-21 WRX STI, 14-17 FXT

    Only 3 left
    $2410$34.43 Save 30%

  • In Stock
    Power Stop [08 - 17 STI, 20 WRX] w/ 4 Piston Front Caliper Front & Rear Z23 Evolution Sport Brake Kit | K4490 - JDMuscleBrake KitspsbK4490
    PowerStop

    Power Stop w/ 4 Piston Front Caliper Front & Rear Z23 Evolution Sport Brake Kit

    Fits: 08-17 WRX STI, 20 WRX

    Only 3 left
    $49463
    Pay over time · Est. $15.46/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 $138.06 off
    In Stock
    DBA 18 - 21 STI 4000 Series XS Drilled / Slotted Rear Rotor | 43051XS - 10 - JDMuscleBrake Rotorsdba43051XS-10
    DBA

    4000 Series XS Drilled & Slotted Rear Rotor

    Fits: 18-21 WRX STI

    Only 6 left
    $21400$352.06 Save $138.06
    Pay over time · Est. $6.69/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 08 - 21 WRX/STi Front Sway Bar Link Kit - JDMuscleEndlinkscobbCB-1225
    COBB Tuning

    Front Sway Bar Link Kit - Heavy Duty Adjustable

    Fits: 15-21 WRX/STI, 18 Type RA, 19 S209

    Only 9 left
    $20500
    Pay over time · Est. $6.41/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 [08 - 21 WRX/STI] Rear Differential Subframe Mount Bushing Inserts - JDMuscleBushing KitscobbCB-4297K
    COBB Tuning

    Rear Differential Subframe Mount Bushing Insert

    Fits: 08-21 WRX/STI, 18 Type RA, 19 S209

    Only 18 left
    $4000

  • In Stock
    IAG Performance [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Competition Series Engine Mounts | IAG - DRV - 2010 - JDMuscleEngine MountsIAG-DRV-2010
    IAG Performance

    Competition Series Engine Mounts

    Fits: 02-07 WRX, 04-21 WRX STI, 04-08 FXT

    Only 1 left
    $27999
    Pay over time · Est. $8.75/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.