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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Up to $25.65 offTorque Solution 08-21 STI / 08-14 WRX PTFE Flex Fuel Add-On Kit | TS-SU-6FLK-AM-P-08-FFA
Regular price $141.00Sale price $141.00 Regular priceUnit price per$166.65 -
Up to $125.77 offTorque Solution 08-21 STI / 08-14 WRX PTFE Fuel Line Kit w/ Flex Fuel | TS-SU-6FLK-AM-P-08-FF
Regular price $452.00Sale price $452.00 Regular priceUnit price per$577.77 -
Up to $89.50 offPerrin 18-21 STI Hi-Power Cold Air Intake Hyper Pink | PSP-INT-326HP
Regular price $268.50Sale price $268.50 Regular priceUnit price per$358.00 -
IAG Performance PTFE Flex Fuel Line Upgrade Kit
Fits: 08-21 STI
Regular price $174.99Sale price $174.99 Regular priceUnit price per$174.99 -
![IAG [08 - 21 STI] Performance PTFE Fuel Line Kit - JDMuscleFuel System KitsIAG-AFD-2210](//jdmuscleusa.com/cdn/shop/products/iag-08-21-sti-performance-ptfe-fuel-line-kit-1028131.jpg?v=1772964127&width=220)
![IAG [08 - 21 STI] Performance PTFE Fuel Line Kit - JDMuscleFuel System KitsIAG-AFD-2210](//jdmuscleusa.com/cdn/shop/products/iag-08-21-sti-performance-ptfe-fuel-line-kit-6650807.jpg?v=1772964128&width=220)
IAG Performance PTFE Fuel Line Kit
Fits: 08-21 STI
Regular price $449.99Sale price $449.99 Regular priceUnit price per$449.99 -
IAG Performance Competition Series Oil Pan w/ Baffle for Various Subaru Models
Regular price From $629.99Sale price From $629.99 Regular priceUnit price per$629.99 -
![IAG [08 - 14 WRX , 08 - 21 STI] PTFE Fuel Line Kit for use w/ COBB Flex Fuel Sensor - JDMuscleFuel Lines and FittingsIAG-AFD-2220](//jdmuscleusa.com/cdn/shop/products/iag-08-14-wrx-08-21-sti-ptfe-fuel-line-kit-for-use-w-cobb-flex-fuel-sensor-5205824.jpg?v=1772964128&width=220)
![IAG [08 - 14 WRX , 08 - 21 STI] PTFE Fuel Line Kit for use w/ COBB Flex Fuel Sensor - JDMuscleFuel Lines and FittingsIAG-AFD-2220](//jdmuscleusa.com/cdn/shop/products/iag-08-14-wrx-08-21-sti-ptfe-fuel-line-kit-for-use-w-cobb-flex-fuel-sensor-9294723.jpg?v=1772964128&width=220)
IAG PTFE Fuel Line Kit for use w/ COBB Flex Fuel Sensor
Fits: 08-14 WRX , 08-21 STI
Regular price $549.99Sale price $549.99 Regular priceUnit price per$549.99 -
IAG Performance Competition Series EJ Timing Belt Tensioner
Regular price $589.99Sale price $589.99 Regular priceUnit price per$589.99 -
IAG ARP 1/2" Head Stud Set for Subaru Multiple Fitments
Regular price $549.99Sale price $549.99 Regular priceUnit price per$549.99 -
IAG Stage 2.5 Subaru EJ25 Closed Deck Short Block for Subaru Multiple Fitments
Regular price From $4,853.68Sale price From $4,853.68 Regular priceUnit price per$4,799.99 -
IAG Braided Fuel Line & Fitting Kit for Subaru Multiple Fitments
Regular price $299.99Sale price $299.99 Regular priceUnit price per$299.99 -
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](//jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2611020.jpg?v=1770331227&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](//jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2980305.jpg?v=1770331227&width=220)
IAG Performance V3 Top Feed Fuel Rails Black
Fits: 02-14 WRX, 07-21 STI, 08-12 LGT, 06-13 FXT
Regular price $219.99Sale price $219.99 Regular priceUnit price per$219.99 -
IAG Braided Fuel Line & Fitting Kit - IAG Top Feed FR for Subaru Multiple Fitments
Regular price $319.99Sale price $319.99 Regular priceUnit price per$319.99 -
In StockTorque Solution HD Cam Bolt for Subaru EJ Single AVCS / Dual AVCS | TS-SU-626-1
Only 2 leftRegular price $19.00Sale price $19.00 Regular priceUnit price per$19.00 -
Up to $6.05 off
In StockMishimoto 2011+ WRX STI Single Ignition Coil | MMIG-STI-11
Only 5 leftRegular price $64.95Sale price $64.95 Regular priceUnit price per$71.00 -
![Compressive Tuning Airblades - [15 - 21 WRX/STI] - JDMuscleFender ShroudsAB151-NYNeon Yellow](//jdmuscleusa.com/cdn/shop/products/compressive-tuning-airblades-15-21-wrxsti-5032486.jpg?v=1770332120&width=220)
![Compressive Tuning Airblades - [15 - 21 WRX/STI] - JDMuscleFender ShroudsAB151-NYNeon Yellow](//jdmuscleusa.com/cdn/shop/products/compressive-tuning-airblades-15-21-wrxsti-9979204.jpg?v=1770332120&width=220)
Compressive Tuning Airblades -
Fits: 15-21 WRX/STI
Regular price $345.00Sale price $345.00 Regular priceUnit price per$345.00
![IAG [08 - 21 STI] Performance PTFE Fuel Line Kit - JDMuscleFuel System KitsIAG-AFD-2210](http://jdmuscleusa.com/cdn/shop/products/iag-08-21-sti-performance-ptfe-fuel-line-kit-1028131.jpg?v=1772964127&width=220)
![IAG [08 - 21 STI] Performance PTFE Fuel Line Kit - JDMuscleFuel System KitsIAG-AFD-2210](http://jdmuscleusa.com/cdn/shop/products/iag-08-21-sti-performance-ptfe-fuel-line-kit-6650807.jpg?v=1772964128&width=220)
![IAG [08 - 14 WRX , 08 - 21 STI] PTFE Fuel Line Kit for use w/ COBB Flex Fuel Sensor - JDMuscleFuel Lines and FittingsIAG-AFD-2220](http://jdmuscleusa.com/cdn/shop/products/iag-08-14-wrx-08-21-sti-ptfe-fuel-line-kit-for-use-w-cobb-flex-fuel-sensor-5205824.jpg?v=1772964128&width=220)
![IAG [08 - 14 WRX , 08 - 21 STI] PTFE Fuel Line Kit for use w/ COBB Flex Fuel Sensor - JDMuscleFuel Lines and FittingsIAG-AFD-2220](http://jdmuscleusa.com/cdn/shop/products/iag-08-14-wrx-08-21-sti-ptfe-fuel-line-kit-for-use-w-cobb-flex-fuel-sensor-9294723.jpg?v=1772964128&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](http://jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2611020.jpg?v=1770331227&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](http://jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2980305.jpg?v=1770331227&width=220)
![Compressive Tuning Airblades - [15 - 21 WRX/STI] - JDMuscleFender ShroudsAB151-NYNeon Yellow](http://jdmuscleusa.com/cdn/shop/products/compressive-tuning-airblades-15-21-wrxsti-5032486.jpg?v=1770332120&width=220)
![Compressive Tuning Airblades - [15 - 21 WRX/STI] - JDMuscleFender ShroudsAB151-NYNeon Yellow](http://jdmuscleusa.com/cdn/shop/products/compressive-tuning-airblades-15-21-wrxsti-9979204.jpg?v=1770332120&width=220)