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2015-2021 WRX STI Mods

IBR Flex Fuel Sensor Kit 2008-2021 WRX / 2007-2021 STI

$599.99 - $599.99
$599.99
$599.99 - $599.99
$599.99

This kit is designed to provide a way to data log and monitor the ethanol content of fuel on most new Subaru Vehicles. Our proprietary controller r...

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Injector Dynamics 1050X Fuel Injectors 2002-2014 WRX / 2007-2021 STI

$546.00 - $546.00
$546.00
$546.00 - $546.00
$546.00

Here are the details: 1050Xcc Injector model Compact body Improved internal flow path increases output by 5% without sacrificing low flow performan...

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Injector Dynamics 1750cc Fuel Injectors 2002-2014 WRX / 2007-2021 STI

$1,218.00 - $1,218.00
$1,218.00
$1,218.00 - $1,218.00
$1,218.00

These are the Injector Dynamics 1750cc Fuel Injectors and are an excellent option for the 2002-2014 Subaru WRX and 2007-2021 STI that needs to supp...

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AEM 340 High Flow Fuel Pump 2008-2014 WRX / 2008-2021 STI

$164.95
$164.95 - $164.95
$164.95
$123.71
$123.71 - $123.71
$123.71

AEM's 340lph E85-Compatible High Flow In-Tank Fuel Pumps feature robust internal construction that is designed to withstand the low lubricity chara...

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AEM 340LPH E85 Fuel Pump

$164.95
$164.95 - $164.95
$164.95
$123.71
$123.71 - $123.71
$123.71

AEM’s 340LPH E85-Compatible High Flow In-Tank Fuel Pumps feature robust internal construction that is designed to withstand the low lubricity chara...

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AEM High Cap Adjustable Fuel Pressure Regulator

$188.95
$188.95 - $188.95
$188.95
$141.71
$141.71 - $141.71
$141.71

AEM's High Cap Universal Adjustable Fuel Pressure Regulator (PN 25-305BK) is the perfect solution for racers who need reliable fuel pressure in hig...

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AEM 340LPH E85 Fuel Pump

$125.95
$125.95 - $125.95
$125.95
$94.46
$94.46 - $94.46
$94.46

AEM’s 340LPH E85-Compatible High Flow In-Tank Fuel Pumps feature robust internal construction that is designed to withstand the low lubricity chara...

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AEM Water/Methanol Injection Kit V2 w/ 1 Gallon Tank

$636.95
$636.95 - $636.95
$636.95
$477.71
$477.71 - $477.71
$477.71

THE AEM WATER/METHANOL INJECTION SYSTEM ADVANTAGEWater/methanol injection for forced induction (turbocharged or supercharged) gas-powered race engi...

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Injector Dynamics 2600-XDS Fuel Injectors 2002-2014 WRX/ 2007-2021 STI

$1,449.00 - $1,449.00
$1,449.00
$1,449.00 - $1,449.00
$1,449.00

Here, you are looking at the Injector Dynamics ID2600-XDS Fuel Injectors. These have been designed to provide your fuel system with optimal flow, a...

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Injector Dynamics 1300cc Fuel Injectors 2002-2014 WRX/ 2007-2021 STI

$945.00 - $945.00
$945.00
$945.00 - $945.00
$945.00

1300cc injector size Top-feed type Designed in partnership with Bosch Motorsport Designed to work with alternative fuels All stainless internals C...

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IAG Street Series Air Oil Separator 2008-2014 WRX / 2008-2021 STI

$499.99
$499.99 - $499.99
$499.99
$424.99
$424.99 - $424.99
$424.99

The IAG Performance V3 Street Series Air / Oil separator (AOS) is an excellent investment to keep your Subaru vehicle running well. The Street Seri...

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IAG PTFE Flex Fuel System Kit w/ ID Injectors, Aeromotive FPR, IAG Fuel Rails 2008-2014 WRX / 2008-2021 STI

$1,849.99 - $2,799.99
$1,849.99 - $2,799.99
$1,849.99
$1,572.49 - $2,379.99
$1,572.49 - $2,379.99
$1,572.49

IAG PTFE FLEX FUEL SYSTEM KIT W/ ID INJECTORS, AEROMOTIVE FPR, IAG FUEL RAILS FOR 2008-14 WRX, 08-21 STI FUEL DELIVERY MADE EASY ...

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IAG PTFE Fuel System Kit w/ ID Injectors, Aeromotive FPR, IAG Fuel Rails 2008-2014 WRX/ 2008-2021 STI

$1,739.99 - $2,699.99
$1,739.99 - $2,699.99
$1,739.99
$1,478.99 - $2,294.99
$1,478.99 - $2,294.99
$1,478.99

IAG PTFE FUEL SYSTEM KIT W/ ID INJECTORS, AEROMOTIVE FPR, IAG FUEL RAILS FOR 2008-14 WRX, 08-21 STI FUEL DELIVERY MADE EASY Whe...

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IAG PTFE Flex Fuel System Kit w/ Aeromotive FPR, IAG Fuel Rails 2008-2014 WRX/ 2008-2021 STI

$1,199.99
$1,199.99 - $1,199.99
$1,199.99
$1,019.99
$1,019.99 - $1,019.99
$1,019.99

IAG PTFE FLEX FUEL SYSTEM KIT W/ AEROMOTIVE FPR, IAG FUEL RAILS FOR 08-14 WRX, 08-21 STI FUEL DELIVERY MADE EASY When designing ...

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IAG PTFE Fuel System Kit w/ Aeromotive FPR, IAG Fuel Rails 2008-2014 WRX / 2008-2021 STI

$1,099.99
$1,099.99 - $1,099.99
$1,099.99
$934.99
$934.99 - $934.99
$934.99

AG PTFE FUEL SYSTEM KIT W/ AEROMOTIVE FPR, IAG FUEL RAILS FOR 08-14 WRX, 08-21 STI FUEL DELIVERY MADE EASY When designing the IA...

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Radium Dual Port Injection Fuel Rails 2002-2014 WRX/ 2004-2021 STI

$249.95 - $249.95
$249.95
$249.95 - $249.95
$249.95

PORTS AND FITTINGS The fuel rail end ports are tapped for 10AN ORB. The top ports are tapped for 8AN ORB.   Appropriate fittings must be selected b...

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Radium Fuel Line Retaining Kit 2008-2021 STI

$99.95 - $99.95
$99.95
$99.95 - $99.95
$99.95

The Radium Engineering fuel line retaining kit supports large aftermarket fuel lines under the 08-21 Subaru Impreza, WRX, and STi.The retainers are...

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Radium Top Feed Fuel Rail Upgrade 2002-2014 WRX/ 2007-2021 STI

$209.95 - $379.95
$209.95 - $379.95
$209.95 - $379.95
$209.95

Reference the chart below to be sure the proper fuel rails are ordered.Manufactured with a large internal bore, the fuel rails can support all nece...

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Injector Dynamics Fuel Injector USCAR to Denso Adapter

$15.75 - $15.75
$15.75
$15.75 - $15.75
$15.75

Here, you are looking at the Injector Dynamics Fuel Injector PnP Adapter USCAR to Denso Adapter. This is available for separate purchase for those ...

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AEM 340LPH High Flow Fuel Pump

$164.95
$164.95 - $164.95
$164.95
$123.71
$123.71 - $123.71
$123.71

AEM 340LPH HIGH FLOW FUEL PUMP AEM’s 340lph E85-Compatible High Flow In-Tank Fuel Pumps feature robust internal construction that is designed to w...

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COBB Tuning Top Feed 1050X Fuel Injectors 2002-2014 WRX / 2007-2021 STI

$625.00 - $625.00
$625.00
$625.00 - $625.00
$625.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Nexgen Flex Fuel Ethanol Sensor Kit 2015-2021 STI

$790.00 - $790.00
$790.00
$790.00 - $790.00
$790.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Fuel Rails/Line Kit Package 2008-2021 STI

$775.00 - $775.00
$775.00
$775.00 - $775.00
$775.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Fuel System Package 2008-2021 STI

$1,825.00 - $1,825.00
$1,825.00
$1,825.00 - $1,825.00
$1,825.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing ...

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COBB Tuning Fuel Pressure Regulator Kit 2008-2021 STI

$410.00 - $410.00
$410.00
$410.00 - $410.00
$410.00

EMISSIONS This part is in the process of external testing with the EO process ongoing. NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY EMISSION C...

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COBB Tuning Fuel Pressure Regulator for Fuel Rail Kit 2008-2021 STI

$380.00 - $380.00
$380.00
$380.00 - $380.00
$380.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Fuel Rails 2008-2021 STI

$300.00 - $300.00
$300.00
$300.00 - $300.00
$300.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Fuel Pressure Sensor Kit (5 PIN) 2015-2021 STI

$275.00 - $275.00
$275.00
$275.00 - $275.00
$275.00

EMISSIONS 50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the ...

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COBB Tuning High Flow Fuel Pump 2008-2014 WRX / 2008-2021 STI

$190.00 - $190.00
$190.00
$190.00 - $190.00
$190.00

EMISSIONS 50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the ...

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COBB Tuning 2.5L Spark Plugs 2006-2014 WRX / 2004-2021 STI

$65.00 - $65.00
$65.00
$65.00 - $65.00
$65.00

This is the factory spark plug as installed in the 2018 Subaru WRX STI Type RA and 2019 Subaru WRX STI. The main differences are a heat range tha...

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NGK Laser Iridium Spark Plug Set 2015-2021 WRX

$66.76 - $66.76
$66.76
$66.76 - $66.76
$66.76

NGK Laser Iridium spark plugs provide superior ignitability and long service life. Fine wire iridium tipped center electrode and fine wire platinum...

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COBB Tuning Can Flex Fuel Upgrade + Fuel Pressure Kit 2018-2021 WRX

$1,280.00 - $1,280.00
$1,280.00
$1,280.00 - $1,280.00
$1,280.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Can Flex Fuel Upgrade 2018-2021 WRX

$1,035.00 - $1,035.00
$1,035.00
$1,035.00 - $1,035.00
$1,035.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Previous Sensor Kit to Can Flex Fuel Upgrade + Fuel Pressure Kit 2018-2021 WRX

$840.00 - $840.00
$840.00
$840.00 - $840.00
$840.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Previous Sensor Kit to Can Flex Fuel Upgrade 2018-2021 WRX

$735.00 - $735.00
$735.00
$735.00 - $735.00
$735.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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COBB Tuning Can Flex Fuel Upgrade + Fuel Pressure Kit 2015-2017 WRX

$1,280.00 - $1,280.00
$1,280.00
$1,280.00 - $1,280.00
$1,280.00

EMISSIONS This part is legal under the provisions of EPA’s Anti-Tampering Policy. COBB Tuning has established a reasonable basis (testing results...

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If you own a Subaru WRX STI, you know you have the perfect platform to craft a masterpiece on wheels. At WRXDaily, we understand that every enthusiast has a vision, and we’re here to offer the WRX STI mods you need to bring yours to life. With products tailored to elevate performance, enhance style, and perfect handling, our curated selection puts endless possibilities at your fingertips. 

No matter what you need, our Subaru WRX STI modifications deliver quality and reliability you can trust. From high-performance upgrades to must-have Subaru STI accessories, we have everything you need to create a car that’s as bold and unique as your passion for driving. Own a 2018 WRX? We offer a variety of 2018 WRX parts designed to fit your specific model. 

With WRXDaily, your Subaru becomes a true reflection of your style and ambition. Browse our selection of WRX STI mods today and start your next build!