Optimize your Subaru STI 2004-2007 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.
Subaru STI 2004-2007 Engine Parts
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![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Black | 125009 - JDMuscleAir Intake and MAF Hosesgrm125009](//jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-black-125009-7645281.jpg?v=1786515804&width=220)
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Black | 125009 - JDMuscleAir Intake and MAF Hosesgrm125009](//jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-black-125009-5838336.jpg?v=1786515804&width=220)
In StockGrimmSpeed Post MAF Hose Kit - Black | 125009
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Only 1 leftRegular price $121.00Sale price $121.00 Regular priceUnit price per$121.00 -
GrimmSpeed MAF Block Off - WRX/STI / Forester XT 2002-21
Regular price From $62.00Sale price From $62.00 Regular priceUnit price per$62.00 -
In StockGrimmspeed 3-Port Electronic Boost Control Solenoid - SUBARU 06-07 WRX, 04-07 STI, 04-08 FXT | 057002
Only 1 leftRegular price $190.00Sale price $190.00 Regular priceUnit price per$190.00 -
In StockGrimmSpeed Top Mount Intercooler Thermal - Black
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 1 leftRegular price $1,065.00Sale price $1,065.00 Regular priceUnit price per$1,065.00 -
Up to $3.40 off
In StockCusco High Pressure Radiator Cap - Universal
Only 3 leftRegular price $30.60Sale price $30.60 Regular priceUnit price per$34.00 -
Up to $10 off
In StockAEM DryFlow Air Filter Kit 4in x 7in DRYFLOW - Universal | 21-2057DK
Only 18 leftRegular price $62.99Sale price $62.99 Regular priceUnit price per$72.99 -
Subaru OEM Turbo Banjo Bolt with Screen
Fits: 04-21 WRX STI, 04-14 WRX
Regular price $18.97Sale price $18.97 Regular priceUnit price per$18.97 -
GSC Power Division Beehive Spring & Titanium Retainer Kit WRX/STI EJ257 2004-2020 | 5043
Regular price $386.39Sale price $386.39 Regular priceUnit price per$0.00 -
In StockGo Fast Bits 33mm Recirc hose plug - suit 32mm | 1-1/4" ID hose | 5533
Only 1 leftRegular price $21.00Sale price $21.00 Regular priceUnit price per$21.00 -
Up to $80 off
In StockWeapon R Hybrid Tank
Fits: 02-07 WRX, 04-07 STI
Only 7 leftRegular price $219.00Sale price $219.00 Regular priceUnit price per$299.00 -
Up to $0.75 off
In StockRadium Engineering 3/8in SAE Female To 5/16 Barb - Universal
Only 6 leftRegular price $14.20Sale price $14.20 Regular priceUnit price per$14.95 -
Up to $0.50 off
In StockRadium 8AN ORB to 5/16in Barb - Universal
Only 9 leftRegular price $9.45Sale price $9.45 Regular priceUnit price per$9.95 -
Up to $0.50 off
In StockRadium Engineering 6AN Coupler Female To Female - Straight - Universal
Only 5 leftRegular price $9.45Sale price $9.45 Regular priceUnit price per$9.95 -
Up to $0.50 off
In StockRadium Engineering FPR Spring- Wide Range Use with Radium MPR, DMR, and FST-R
Fits: Universal
Only 1 leftRegular price $9.45Sale price $9.45 Regular priceUnit price per$9.95 -
Up to $1.25 off
In StockRadium Engineering 5/16in SAE Female to -6AN Male Low Profile - Universal
Only 7 leftRegular price $23.70Sale price $23.70 Regular priceUnit price per$24.95 -
Up to $0.75 off
In StockRadium Engineering Duckbill Valve - Universal
Only 7 leftRegular price $14.20Sale price $14.20 Regular priceUnit price per$14.95
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Black | 125009 - JDMuscleAir Intake and MAF Hosesgrm125009](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-black-125009-7645281.jpg?v=1786515804&width=220)
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Black | 125009 - JDMuscleAir Intake and MAF Hosesgrm125009](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-black-125009-5838336.jpg?v=1786515804&width=220)
