Optimize your Subaru STI 2015-2021 engine's performance with a comprehensive range of top-quality aftermarket parts from industry-leading brands. Elevate the power and efficiency of your vehicle with ETS, HKS, Perrin, Mishimoto, AMS, Grimmspeed, Cobb, Remark, PLM, Turbosmart, IAG Performance, and more. Enhance airflow and filtration through AIR INTAKE DUCTS and COLD AIR INTAKES, while maintaining engine cleanliness with AIR OIL SEPARATORS and CATCH CANS. Experience impeccable control and responsiveness with BLOW OFF VALVES and BOOST CONTROL SOLENOID COVERS, complemented by the reliability of ENGINE MOUNTS and meticulously crafted ENGINE MANAGEMENT HARNESSES. Simplify maintenance and improve overall performance with DIPSTICKS and explore comprehensive ENGINE PACKAGE DEALS for a holistic approach to upgrading your Subaru WRX's engine. Unleash the full potential of your vehicle through precision-engineered components designed to deliver both power and durability, all meticulously designed to give your Subaru STI the edge on the road or track.
2015-2021 Subaru WRX STI Engine Parts
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In StockGates 04-14 WRX/ 04-21 STI/ 05-09 LGT Timing Belt Kit | TCK328
Only 14 leftRegular price $358.00Sale price $358.00 Regular priceUnit price per$358.00 -
Up to $31.99 off
In StockEagle 02-14 WRX/ 04-21 STI Connecting Rods
Only 5 leftRegular price $375.00Sale price $375.00 Regular priceUnit price per$406.99 -
In StockInjector Dymanics Fuel Injector PnP Adapter USCAR to Denso - Universal
Regular price $17.33Sale price $17.33 Regular priceUnit price per$17.33 -
In StockRemark Stainless Steel Axle Back w/ Double Wall Burnt Tips | RO-TTVA-D
Fits: 15-21 WRX/STI
Regular price $715.00Sale price $715.00 Regular priceUnit price per$715.00 -
![Remark [15-21 WRX/STI] Axle Back Exhaust Stainless Single Wall Tips | RO-TSVA-S](//jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-stainless-single-wall-tips-subaru-wrxsti-2015-2019-axle-back-exhausts-remark-ro-tsva-s.jpg?v=1745512177&width=220)
In StockRemark Axle Back Exhaust Stainless Single Wall Tips | RO-TSVA-S
Fits: 15-21 WRX/STI
Regular price $595.00Sale price $595.00 Regular priceUnit price per$595.00 -
Killer B Motorsport 4-1 Holy Header 2-Bolt w/ SwainTech Ceramic Coating WRX 2002-2014 / STI 2004-21 | HH-2BOLT-SWAIN
Regular price $1,989.00Sale price $1,989.00 Regular priceUnit price per$1,989.00 -
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Stainless Steel Tips | 140595](//jdmuscleusa.com/cdn/shop/products/borla-s-type-atak-quad-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-140595-cat-back-exhaust-system-borla-bor140595.jpg?v=1614510291&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Stainless Steel Tips | 140595](//jdmuscleusa.com/cdn/shop/products/borla-s-type-atak-quad-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-140595-cat-back-exhaust-system-borla-bor140595-2.jpg?v=1614672886&width=220)
Up to $216 off
In StockBorla S-Type Cat Back Exhaust w/ Stainless Steel Tips | 140595
Fits: 15-21 WRX/STI
Only 5 leftRegular price $1,799.99Sale price $1,799.99 Regular priceUnit price per$2,015.99 -
Up to $434.20 offInvidia N1 Cat Back Exhaust w/ Bead Blasted Piping Titanium Tip
Fits: 15-21 WRX/STI
Regular price $956.00Sale price $956.00 Regular priceUnit price per$1,390.20 -
![GReddy [15-21 WRX/STI] Supreme SP Cat-Back Exhaust System | 10168202](//jdmuscleusa.com/cdn/shop/products/greddy-supreme-sp-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2020-10168202-cat-back-exhaust-system-greddy-gre10168202.jpg?v=1643819343&width=220)
![GReddy [15-21 WRX/STI] Supreme SP Cat-Back Exhaust System | 10168202](//jdmuscleusa.com/cdn/shop/products/greddy-supreme-sp-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2020-10168202-cat-back-exhaust-system-greddy-gre10168202-2.jpg?v=1643819343&width=220)
Up to $59.75 offGReddy Supreme SP Cat-Back Exhaust System | 10168202
Fits: 15-21 WRX/STI
Regular price $1,135.25Sale price $1,135.25 Regular priceUnit price per$1,195.00 -
In StockKartboy Battery Tie Down | KB-100-BT
Fits: Most Subaru Models
Regular price $45.00Sale price $45.00 Regular priceUnit price per$45.00 -
Grimmspeed 02-07 WRX / 04-21 STI / 04-08 FXT Top Mount Intercooler Y-Pipe Kit Red | 090095
Regular price $245.00Sale price $245.00 Regular priceUnit price per$245.00 -
In StockTorque Solution T-Bolt Hose Clamp - Universal
Only 16 leftRegular price From $15.00Sale price From $15.00 Regular priceUnit price per$15.00 -
Up to $18 off
In StockOVERTAKE Catback Exhaust Hardware Refresh Kit
Fits: 08-26 WRX, 08-21 STI Sedan
Regular price $89.00Sale price $89.00 Regular priceUnit price per$107.00 -
![COBB [02 - 07 WRX, 04 - 21 STI, 06 - 08 FXT] LF Bypass Valve | 712665 - JDMuscleBlow Off Valvescobb712665](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-06-08-fxt-lf-bypass-valve-712665-7110805.jpg?v=1770336431&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 06 - 08 FXT] LF Bypass Valve | 712665 - JDMuscleBlow Off Valvescobb712665](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-06-08-fxt-lf-bypass-valve-712665-1547680.jpg?v=1770336431&width=220)
In StockCOBB LF Bypass Valve
Fits: 02-07 WRX, 04-21 STI, 06-08 FXT
Regular price $375.00Sale price $375.00 Regular priceUnit price per$375.00 -
![Perrin [15 - 21 WRX/STI] Radiator Shroud With OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 4NY - JDMuscleRadiator ShroudsperPSP-ENG-512-4NY](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-neon-yellow-psp-eng-512-4ny-3779680.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud With OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 4NY - JDMuscleRadiator ShroudsperPSP-ENG-512-4NY](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-neon-yellow-psp-eng-512-4ny-2778693.jpg?v=1770327921&width=220)
Up to $36.25 off
In StockPerrin Radiator Shroud With OEM Intake Scoop - Neon Yellow | PSP-ENG-512-4NY
Fits: 15-21 WRX/STI
Only 8 leftRegular price $108.75Sale price $108.75 Regular priceUnit price per$145.00 -
![COBB [15 - 21 WRX/STI, 18 STI TYPE RA, 19 STI S209] Redline Gloss Carbon Fender Shrouds - JDMuscleFender Shroudscobb725160](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-18-sti-type-ra-19-sti-s209-redline-gloss-carbon-fender-shrouds-8205182.jpg?v=1770321315&width=220)
In StockCOBB Redline Gloss Carbon Fender Shrouds
Fits: 15-21 WRX/STI, 18 STI TYPE RA, 19 STI S209
Only 12 leftRegular price $395.00Sale price $395.00 Regular priceUnit price per$395.00
![Remark [15-21 WRX/STI] Axle Back Exhaust Stainless Single Wall Tips | RO-TSVA-S](http://jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-stainless-single-wall-tips-subaru-wrxsti-2015-2019-axle-back-exhausts-remark-ro-tsva-s.jpg?v=1745512177&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Stainless Steel Tips | 140595](http://jdmuscleusa.com/cdn/shop/products/borla-s-type-atak-quad-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-140595-cat-back-exhaust-system-borla-bor140595.jpg?v=1614510291&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Stainless Steel Tips | 140595](http://jdmuscleusa.com/cdn/shop/products/borla-s-type-atak-quad-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-140595-cat-back-exhaust-system-borla-bor140595-2.jpg?v=1614672886&width=220)
![GReddy [15-21 WRX/STI] Supreme SP Cat-Back Exhaust System | 10168202](http://jdmuscleusa.com/cdn/shop/products/greddy-supreme-sp-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2020-10168202-cat-back-exhaust-system-greddy-gre10168202.jpg?v=1643819343&width=220)
![GReddy [15-21 WRX/STI] Supreme SP Cat-Back Exhaust System | 10168202](http://jdmuscleusa.com/cdn/shop/products/greddy-supreme-sp-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2020-10168202-cat-back-exhaust-system-greddy-gre10168202-2.jpg?v=1643819343&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 06 - 08 FXT] LF Bypass Valve | 712665 - JDMuscleBlow Off Valvescobb712665](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-06-08-fxt-lf-bypass-valve-712665-7110805.jpg?v=1770336431&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 06 - 08 FXT] LF Bypass Valve | 712665 - JDMuscleBlow Off Valvescobb712665](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-06-08-fxt-lf-bypass-valve-712665-1547680.jpg?v=1770336431&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud With OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 4NY - JDMuscleRadiator ShroudsperPSP-ENG-512-4NY](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-neon-yellow-psp-eng-512-4ny-3779680.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud With OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 4NY - JDMuscleRadiator ShroudsperPSP-ENG-512-4NY](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-neon-yellow-psp-eng-512-4ny-2778693.jpg?v=1770327921&width=220)
![COBB [15 - 21 WRX/STI, 18 STI TYPE RA, 19 STI S209] Redline Gloss Carbon Fender Shrouds - JDMuscleFender Shroudscobb725160](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-18-sti-type-ra-19-sti-s209-redline-gloss-carbon-fender-shrouds-8205182.jpg?v=1770321315&width=220)