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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Grimmspeed 15-17 STI Sound Generator Plug Kit Red | 125016
Regular price $52.00Sale price $52.00 Regular priceUnit price per$52.00 -
Grimmspeed 15-17 STI Post MAF Hose Kit - Black | 125013
Regular price $101.00Sale price $101.00 Regular priceUnit price per$101.00 -
Grimmspeed 15-17 STI Post MAF Hose Kit Red | 125014
Regular price $121.00Sale price $121.00 Regular priceUnit price per$121.00 -
GrimmSpeed 02-14 WRX / 04-21 STI Alternator Cover Hi-Vis Neon Yellow | 099050
Regular price $141.00Sale price $141.00 Regular priceUnit price per$141.00 -
GrimmSpeed Radiator Shroud - Neon Green Powdercoat WRX/STI 15+| 096056
Regular price $124.00Sale price $124.00 Regular priceUnit price per$124.00 -
Injen 15-17 STI Cold Air Intake w/ MR Tech and Heat Shield | SP1206BLK
Regular price $437.91Sale price $437.91 Regular priceUnit price per$437.91 -
Injen 15-17 STI Cold Air Intake w/ MR Tech and Heat Shield - Polished | SP1206P
Regular price $437.91Sale price $437.91 Regular priceUnit price per$437.91 -
In StockInjen 15-17 STI Cold Air Intake Wrinkle Red | SP1206WR
Only 8 leftRegular price $437.91Sale price $437.91 Regular priceUnit price per$437.91 -
![HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust | 31021-BF001](//jdmuscleusa.com/cdn/shop/products/31021-bf001.jpg?v=1624758467&width=220)
![HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust | 31021-BF001](//jdmuscleusa.com/cdn/shop/products/a2d3878c4023110f73bd61a70bd9fc23.jpg?v=1624758467&width=220)
In StockHKS Legamax Premium Catback Exhaust
Fits: 15-21 WRX/STI
Regular price $1,990.00Sale price $1,990.00 Regular priceUnit price per$1,990.00 -
Up to $424.80 offMXP SP Cat Back Exhaust Stainless Steel Burnt Tips | MXSPGVB
Fits: 15-21 WRX/STI
Regular price $1,150.20Sale price $1,150.20 Regular priceUnit price per$1,575.00 -
MILLTEK SPORT CAT-BACK EXHAUST WRX/STI 15-21 | SSXSB49
Regular price $2,119.00Sale price $2,119.00 Regular priceUnit price per$2,119.00 -
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Ceramic Black Steel Tips | 140595CB](//jdmuscleusa.com/cdn/shop/products/97c4de089d5bbe26223182719ae94958.jpg?v=1624332636&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Ceramic Black Steel Tips | 140595CB](//jdmuscleusa.com/cdn/shop/products/10b6db925b45e977be339cb97b625bc0.jpg?v=1624332636&width=220)
Up to $234 off
In StockBorla S-Type Cat Back Exhaust w/ Ceramic Black Steel Tips
Fits: 15-21 WRX/STI
Only 6 leftRegular price $1,949.99Sale price $1,949.99 Regular priceUnit price per$2,183.99 -
In StockaFe 15-17 STI Power Takeda Performance Oiled 5-Layer Filter Intake System | TA-4306B-R
Only 4 leftRegular price $399.00Sale price $399.00 Regular priceUnit price per$399.00 -
aFe 15-17 STI Power Takeda Performance Dried 3-Layer Filter Intake System | TA-4306B-D
Regular price $410.00Sale price $410.00 Regular priceUnit price per$410.00 -
ETS 15-21 WRX / 15-18 STI Axle Back Exhaust Stainless Steel Tips w/ No Muffler | 200-30-EXH-001
Regular price $595.00Sale price $595.00 Regular priceUnit price per$595.00 -
ETS 2.5" Axle Back Exhaust w/ Muffler | 15-2018 WRX/STI
Regular price $695.00Sale price $695.00 Regular priceUnit price per$695.00
![HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust | 31021-BF001](http://jdmuscleusa.com/cdn/shop/products/31021-bf001.jpg?v=1624758467&width=220)
![HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust | 31021-BF001](http://jdmuscleusa.com/cdn/shop/products/a2d3878c4023110f73bd61a70bd9fc23.jpg?v=1624758467&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Ceramic Black Steel Tips | 140595CB](http://jdmuscleusa.com/cdn/shop/products/97c4de089d5bbe26223182719ae94958.jpg?v=1624332636&width=220)
![Borla [15-21 WRX/STI] S-Type Cat Back Exhaust w/ Ceramic Black Steel Tips | 140595CB](http://jdmuscleusa.com/cdn/shop/products/10b6db925b45e977be339cb97b625bc0.jpg?v=1624332636&width=220)
