2015-2021 Subaru STI Parts & Accessories

3344 products

Clear all
  • Up to $39.80 off
    In Stock
    Perrin [15 - 25 WRX, 05 - 21 STI, 15 - 22 Outback/Legacy, 19 - 22 Forester] 7mm Wheel Spacers Black | PSP - WHL - 107BK - JDMuscleWheel Spacers and AdaptersperPSP-WHL-107BK
    Perrin Performance

    Perrin 7mm Wheel Spacers Black

    Fits: 15-25 WRX, 05-21 WRX STI, 15-22 Outback/Legacy, 19-22 Forester

    Black Friday Deal: 20% Off Ends 1/4
    $15920$199.00 Save $39.80

  • In Stock
    GReddy [15-25 WRX, 15-21 STI] Type-S Polished Radiator Cap
    GReddy

    Type-S Polished Radiator Cap

    Fits: 15-25 WRX, 15-21 STI

    Only 8 left
    $2375
  • Megan Racing [15 - 21 WRX/STI / 13+ BRZ/FRS/86 / 13 - 17 Crosstrek] Rear Lower Control Arms | MRS - SC - 0621 - V3 - JDMuscleControl ArmsMRSMRS-SC-0621-V3
    Megan Racing

    Rear Lower Control Arms | MRS-SC-0621-V3

    Fits: 15-21 WRX/STI / 13+ BRZ/FRS/86 / 13-17 Crosstrek

    $44400

  • In Stock
    COBB [04 - 21 STI] Double Adjustable Short Throw Shifter | 215315 - JDMuscleShort Throw Shifterscobb215315
    COBB Tuning

    Double Adjustable Short Throw Shifter

    Fits: 04-21 WRX STI

    $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.

  • In Stock
    COBB [02 - 14 WRX, 07 - 21 STI, 07 - 12 Legacy GT, 06 - 13 Forester XT] Top Feed 1050X Fuel Injectors | 312150 - JDMuscleFuel Injectors and Accessoriescobb312150
    COBB Tuning

    Top Feed 1050X Fuel Injectors

    Fits: 02-14 WRX, 07-21 WRX STI, 07-12 Legacy GT, 06-13 Forester XT

    $62500
    Pay over time · Est. $19.53/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 $220 off
    In Stock
    PLM [08 - 14 WRX, 08 - 21 STI] Power Driven WRX & STI Downpipe - JDMuscleFront Pipes and Downpipes / J - PipesPLM-SUB-DP-0814-CATHigh Flow Cat
    Private Label MFG

    PLM Power Driven WRX & STI Downpipe

    Fits: 08-14 WRX, 08-21 STI

    Only 8 left
    $57500$795.00 Save $220
    Pay over time · Est. $17.97/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 [15-21 WRX/STI] Bumper Bar Black Powder | 090261 - JDMuscleIntercooler Installation Kitsgrm090261
    GrimmSpeed

    Front Mount Intercooler Bumper Bar

    Fits: 15-21 WRX/WRX STI

    $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.
  • Megan Racing [15-21 WRX/STI] Rear Toe Arms | MRS-SU-0371 - JDMuscleTrailing ArmsMRSMRS-SU-0371
    Megan Racing

    Rear Toe Arms

    Fits: 15-21 WRX/STI

    $23160
  • Up to $42.32 off
    In Stock
    Torque Solution [04-21 STI] Short Shifter & Bushings Combo - JDMuscleShifter and Bushing CombostqsTS-SS-001C
    Torque Solution

    Short Shifter & Bushings Combo

    Fits: 04-21 WRX STI

    Only 17 left
    $19100$233.32 Save $42.32
  • Up to $46.09 off
    In Stock
    XClutch 04-21 Subaru STI Clutch Kit 9in Twin Sprung Organic Discs w/ Flywheel | XKSU23531-2A - JDMuscleClutchesXCLXKSU23531-2A
    XClutch

    Clutch Kit 9in Twin Sprung Organic Discs w/ Flywheel

    Fits: 04-21 WRX STI

    Only 4 left
    $1,68357$1,729.66 Save $46.09
    Pay over time · Est. $52.61/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.
  • Remark [15-21 WRX/STI] R1-Spec Catback Exhaust Titanium Muffler Section w/ Burnt Tip | RK-C1076S-01T - JDMuscleCat Back Exhaust SystemremRK-C1076S-01T
    Remark

    R1-Spec Single-Exit Cat-Back Exhaust w/ Titanium Muffler & Burnt Tip

    Fits: 15-21 WRX/STI

    $1,09500
    Pay over time · Est. $34.22/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
    JDMuscle [15-21 WRX/STI] Tanso Carbon Fiber Trunk Protective Cover
    JDMuscle

    Carbon Fiber Trunk Protective Cover *Special Order*

    Fits: 15-21 WRX/STI

    Only 1 left
    $23900
    Pay over time · Est. $7.47/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 $12.40 off
    In Stock
    Perrin [18-21 WRX/STI] License Plate Delete Reversible Black | PSP-BDY-112BK
    Perrin Performance

    Perrin License Plate Delete Reversible Black

    Fits: 18-21 WRX/STI

    Only 9 left
    Black Friday Deal: 20% Off Ends 1/4
    $4960$62.00 Save 20%
  • GCS Carbon Fiber E-Brake Replacement Handle - Subaru Models | inc. 2015+ WRX/STI / 2013+ BRZ
    GCS

    Carbon Fiber E-Brake Replacement Handle - Subaru Models | inc. 2015+ WRX/STI / 2013+ BRZ

    $7000
  • Process West 06-21 STI Intake Manifold Street Version Black | PWIM002B
    Process West

    Intake Manifold Street Version - Black

    Fits: 06-21 WRX STI

    $2,33300
    Pay over time · Est. $72.91/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
    Gates 02-14 WRX/ 04-21 STI Micro-V Belt Alternator & Power Steering Belt | K050344
    Gates

    Micro-V Belt Alternator & Power Steering Belt

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

    Only 7 left
    $2900

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.