3344 products

  • Remark 15-21 WRX/STI Sports Touring Resonated Cat Back w/ Polished Stainless Tips | RK-C4076S-01C
    Remark

    Remark

    Fits: 15-21 WRX

    $1,49500
    Pay over time · Est. $46.72/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.

  • Remark 15-21 WRX/STI Sports Touring Non Resonated Cat Back w/ Burnt Stainless Tips | RK-C4076S-01T
    Remark

    Remark

    Fits: 15-21 WRX

    $1,49500
    Pay over time · Est. $46.72/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.

  • Up to $57.05 off
    In Stock
    Mishimoto 15-21 STI Oil Cooler Kit | MMOC-STI-15
    Mishimoto

    Oil Cooler Kit - Silver

    Fits: 15-21 WRX STI

    Only 1 left
    $57095$628.00 Save $57.05
    Pay over time · Est. $17.84/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 $57.05 off
    In Stock
    Mishimoto 15-21 STI Oil Cooler Kit Black | MMOC-STI-15BK
    Mishimoto

    Oil Cooler Kit - Black

    Fits: 15-21 WRX STI

    Only 7 left
    $57095$628.00 Save $57.05
    Pay over time · Est. $17.84/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 $70.05 off
    Mishimoto Top Mount Intercooler Silver w/ Red Hoses 2008-21 STI | MMTMIC-STI-08SLRD
    Mishimoto
    $69595$766.00 Save $70.05
    Pay over time · Est. $21.75/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.

  • Up to $94.48 off
    In Stock
    DBA 04-17 STI Street Series Drilled / Slotted Front Rotor | 654X-10
    DBA

    Street Series Front Drilled & Slotted Rotor

    Fits: 04-17 WRX STI, 08-14 WRX

    Only 13 left
    $15900$253.48 Save $94.48
  • Up to $279.84 off
    In Stock
    DBA 04-17 STI 5000 Series Drilled / Slotted 2 Piece Front Rotor w/ Gold Hat | 5654GLDXS-10
    DBA
    Only 10 left
    $46800$747.84 Save $279.84
    Pay over time · Est. $14.63/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 $81.28 off
    In Stock
    DBA 08-17 STI / 08-14 WRX Street Series Rear Drilled & Slotted Rotor | 2656X-10
    DBA

    Street Series Rear Drilled & Slotted Rotor

    Fits: 08-14 WRX, 08-17 WRX STI

    Only 12 left
    $13700$218.28 Save $81.28
  • Up to $27 off
    Cusco Pillowball Front Lower Arm Bar Bushings WRX/STI 2008-2014
    Cusco

    Pillowball Front Lower Arm Bar Bushing

    Fits: 08-14 WRX STI, 15-21 WRX/STI

    $24300$270.00 Save $27
    Pay over time · Est. $7.59/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 $63 off
    In Stock
    Cusco 08-21 WRX/STI / 08-13 Forester / 12-17 Crosstrek Power Brace Floor Center | 692-492-C
    Cusco

    Power Brace Floor Center

    Fits: 08-21 WRX/STI, 13-17 Crosstrek

    Only 4 left
    $56700$630.00 Save $63
    Pay over time · Est. $17.72/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.

  • Up to $99.50 off
    In Stock
    Cusco Rear Differential Cover Blue Increased Capacity Subaru Impreza WRX STI | R180 End
    Cusco
    Only 5 left
    $89550$995.00 Save $99.50
    Pay over time · Est. $27.98/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 $40 off
    In Stock
    Cusco 08-19 WRX/STI / 09-13 Forester Front Pillow Ball Upper Mounts | 692 410 A
    Cusco

    Front Pillow Ball Upper Mounts

    Fits: 08-21 WRX/STI, 09-13 Forester

    Only 6 left
    $36000$400.00 Save $40
    Pay over time · Est. $11.25/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.

  • Up to $44 off
    In Stock
    Cusco Front Sway Bar 26mm Subaru STI 15-21
    Cusco

    Front Sway Bar 26mm

    Fits: 15-21 WRX STI

    Only 5 left
    $39600$440.00 Save $44
    Pay over time · Est. $12.38/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.

  • Up to $18.50 off
    Cusco Belt Cover WRX 2008-2014 / STI 2008-2019
    Cusco

    Belt Cover

    Fits: 08-14 WRX, 08-21 STI

    $16650$185.00 Save $18.50

  • In Stock
    Competition Clutch 04-21 STI Stage 4 6-Puck Clutch Kit | 15030-1620
    Competition Clutch
    Only 5 left
    $70000
    Pay over time · Est. $21.88/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 $187 off
    In Stock
    ACT Heavy Duty Clutch Kit 6-Puck Solid Subaru Legacy GT Spec B 2007-2009 | SB10-HDR6
    ACT

    Heavy Duty Clutch Kit 6-Puck Solid

    Fits: 07-09 Legacy GT spec.B

    Only 4 left
    $79900$986.00 Save $187
    Pay over time · Est. $24.97/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.

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.