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2015-2021 WRX & STI Mods

GrimmSpeed Black V2 Bypass Valve 2015-2021 WRX

$269.00
$269.00 - $269.00
$269.00
$269.00 - $269.00

DESCRIPTION The GrimmSpeed V2 Bypass Valve received many upgrades such as a redesigned the internal piston to eliminate the potential failure point...

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GrimmSpeed V2 Cast Aluminum Turbo Inlet 2015-2021 WRX

$214.00
$214.00 - $214.00
$214.00
$214.00 - $214.00

DESCRIPTION One of the biggest complaints we’ve heard from 2015-21 WRX owners has to do with cracks forming in their OEM plastic turbo inlets from ...

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Motul 8100 X-Clean EFE 5W-30 Engine Oil Change Kit 2015-2026 WRX

$72.86 - $87.03
$72.86 - $87.03
$72.86
$72.86 - $87.03

The Motul 8100 X-Clean 5W-30 Engine Oil Change Kit is an easy, convenient solution for engine oil changes! It comes with everything you need for th...

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Subaru OEM Super Coolant 1 Gallon

$31.16
$31.16 - $31.16
$31.16
$31.16 - $31.16

Formulated for long-lasting corrosion and rust protection for all cooling system components, this prediluted antifreeze/engine coolant prevents the...

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Subaru OEM Engine Oil Filter 2015-2026 WRX

$10.25
$10.25 - $10.25
$10.25
$10.25 - $10.25

The importance of routine oil changesNo motor oil lasts forever. The heat and friction produced between the moving parts of any engine eventually c...

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GrimmSpeed 3-Port Electronic Boost Control Solenoid 2015-2021 WRX

$182.00
$182.00 - $182.00
$182.00
$182.00 - $182.00

DESCRIPTION The GrimSpeed Electronic Boost Control Solenoid is one of GrimmSpeed's most utilized upgrades due to the durability, simplicity of use,...

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COBB Accessport V3 2015-2021 WRX / 2015-2021 STI

$693.00
$693.00 - $693.00
$693.00
$770.00
$770.00 - $770.00
$770.00

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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NGK Laser Iridium Spark Plug Set 2015-2021 WRX

$60.84
$60.84 - $60.84
$60.84
$60.84 - $60.84

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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GrimmSpeed Dry-Con Air Filters

$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00

DESCRIPTION The GrimmSpeed Dry-Con Air Filter is a high-performance direct-OEM replacement panel filter that has been designed to flow more air whi...

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GrimmSpeed Red V2 Bypass Valve 2002-2007 WRX / 2004-2021 STI

$269.00
$269.00 - $269.00
$269.00
$269.00 - $269.00

DESCRIPTION The GrimmSpeed V2 Bypass Valve received many upgrades such as a redesigned the internal piston to eliminate the potential failure point...

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Invidia Up Pipe w/ EGT Bung 2002-2014 WRX / 2004-2021 STI

$266.00
$266.00 - $266.00
$266.00
$400.00
$400.00 - $400.00
$400.00

DESCRIPTION The Invidia Up-Pipe is a high-performance upgrade for Subaru models, designed to replace the restrictive and failure-prone factory up-p...

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Motul 8100 X-Cess Gen2 5W-40 Engine Oil Change Kit 2002-2014 WRX / 2004-2021 STI

$69.09 - $82.55
$69.09 - $82.55
$69.09
$69.09 - $82.55

The Motul 8100 X-Cess Gen2 5W-40 Engine Oil Change Kit is an easy, convenient solution for engine oil changes! It comes with everything you need fo...

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GrimmSpeed Electronic Boost Control Solenoid 3-Port 2008-2021 STI

$140.00
$140.00 - $140.00
$140.00
$140.00 - $140.00

DESCRIPTION The GrimmSpeed Electronic Boost Control Solenoid is one of GrimmSpeed's most utilized upgrades due to the durability, simplicity of use...

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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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Subaru OEM Engine Oil Filter 2002-2014 WRX / 2004-2021 STI

$9.22
$9.22 - $9.22
$9.22
$9.22 - $9.22

The importance of routine oil changesNo motor oil lasts forever. The heat and friction produced between the moving parts of any engine eventually c...

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

$499.99
$499.99 - $499.99
$499.99
$499.99 - $499.99

SAFEGUARD YOUR SUBARU The IAG Performance Air / Oil Separator (AOS) is a smart upgrade for your Subaru. Developed through years of meticul...

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Koyorad Aluminum Racing Radiator 2008-2021 WRX / 2008-2021 STI

$424.18
$424.18 - $424.18
$424.18
$565.60
$565.60 - $565.60
$565.60

The Hyper V-Core Series is the newest to the Koyorad | Koyo All Aluminum Racing Radiator line up. An engine's cooling system in many newer vehicles...

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Hella SuperTone Horn Kit 2002-2026 WRX / 2004-2021 STI

$43.19
$43.19 - $43.19
$43.19
$50.81
$50.81 - $50.81
$50.81

DESCRIPTION The Hella SuperTone Horn Kit for the 2002+ Subaru WRX and 2004–2021 STI delivers a bold upgrade in both sound and style. Featuring HELL...

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GrimmSpeed 2 Bolt Ceramic Coated Up-Pipe 2002-2014 WRX / 2004-2021 STI

$279.00
$279.00 - $279.00
$279.00
$279.00 - $279.00

EMISSIONS SEMA Certified - SC -GRM01-0145 for listed fitments CARB Certified - EO - #D-896 for listed fitments DESCRIPTION The GrimmSpeed Ceramic ...

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GrimmSpeed Red Charge Pipe Kit 2015-2021 WRX

$319.00
$319.00 - $319.00
$319.00
$319.00 - $319.00

DESCRIPTION The GrimmSpeed Top Mount Intercooler Charge Pipe Kit is a redesigned performance upgrade over the OEM plastic unit that is restrictive ...

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COBB Tuning SF Stage 1+ Power Package 2015-2021 WRX

$1,103.00
$1,103.00 - $1,103.00
$1,103.00
$1,180.00
$1,180.00 - $1,180.00
$1,180.00

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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PLM EWG 38mm Up-Pipe w/ Dump Tube 2002-2014 WRX / 2004-2021 STI

$339.00
$339.00 - $339.00
$339.00
$339.00 - $339.00

PLM Private Label Mfg. Power Driven Subaru EWG Up-Pipe with Dump Tube 38mm features a unique designed up pipe which gives you the option to install...

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GrimmSpeed Red Stealthbox Intake 2015-2021 WRX

$425.00
$425.00 - $425.00
$425.00
$425.00 - $425.00

DESCRIPTION The GrimmSpeed Red StealthBox Cold Air Intake System is the result of countless invested hours in research and development to provide t...

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OLM Carbon Fiber Hood Struts 2015-2021 WRX / 2015-2021 STI

$109.00
$109.00 - $109.00
$109.00
$109.00 - $109.00

DESCRIPTION Add a little style to your hood struts by swapping them for these OLM Carbon Fiber Hood Struts. This piece offers the same OE style and...

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GrimmSpeed Unequal Length Header 2002-2014 WRX/ 2004-2021 STI

$1,029.00
$1,029.00 - $1,029.00
$1,029.00
$1,029.00 - $1,029.00

DESCRIPTION GrimmSpeed believes that there has not been any major changes to the unequal exhaust manifold in some time, and this is due to the tigh...

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GrimmSpeed High Lift Hood Struts 2015-2026 WRX / 2015-2021 STI

$109.00
$109.00 - $109.00
$109.00
$109.00 - $109.00

DESCRIPTION The biggest issue with the OEM struts that they prevent your hood from opening far enough to allow adequate space for working and light...

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Invidia Up Pipe w/o EGT Bung 2002-2014 WRX / 2004-2021 STI

$266.00
$266.00 - $266.00
$266.00
$400.00
$400.00 - $400.00
$400.00

DESCRIPTION The Invidia Up-Pipe - No EGT Bung is a premium upgrade for Subaru owners looking to improve exhaust flow and turbo efficiency. Designed...

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PLM EWG 44mm Up-Pipe w/ Dump Tube 2002-2014 WRX / 2004-2021 STI

$339.00
$339.00 - $339.00
$339.00
$339.00 - $339.00

PLM Power Driven Subaru 44mm EWG Up-Pipe with Dump Tube features a unique designed Up-pipe which gives you the option to install a 44mm or 45mm ext...

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Boomba Bypass Valve 2015-2021 WRX

$267.90
$267.90 - $267.90
$267.90
$267.90 - $267.90

See the video below to see how badly the stock BPV leaks! We were able to pick up 15 hp and 9 tq from switching to our piece.   This high performan...

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

$600.60
$600.60 - $600.60
$600.60
$600.60 - $600.60

DESCRIPTION If you’re going flex fuel, turning up boost, or upgrading to a turbo that actually needs fuel, the Injector Dynamics ID1050-XDS Top Fee...

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COBB Tuning Stage 1+ Redline Carbon Fiber Power Package 2015-2021 STI

$1,408.00
$1,408.00 - $1,408.00
$1,408.00
$1,485.00
$1,485.00 - $1,485.00
$1,485.00

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 ma...

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GrimmSpeed Red Lightweight Battery Tiedown 2002-2026 WRX / 2004-2021 STI

$43.00
$43.00 - $43.00
$43.00
$43.00 - $43.00

DESCRIPTION Here, you are looking at the GrimmSpeed Lightweight Battery Tiedown. This is a great way to improve the looks and aesthetics of your en...

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

$1,039.50
$1,039.50 - $1,039.50
$1,039.50
$1,039.50 - $1,039.50

DESCRIPTION The Injector Dynamics ID1300-XDS fuel injectors are a high-performance, top-feed injector set built for serious Subaru builds running h...

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NGK Laser Iridium Spark Plug Set 2006-2014 WRX / 2004-2021 STI

$59.00
$59.00 - $59.00
$59.00
$59.00 - $59.00

NGK single iridium plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consis...

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IAG Street Series Black Air Oil Separator 2015-2021 WRX

$499.99
$499.99 - $499.99
$499.99
$499.99 - $499.99

PROTECT YOUR ENGINE The IAG Air / Oil Separator (AOS) is a smart investment to safeguard and improve your Subaru's performance. Developed ...

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GrimmSpeed Black Stealthbox Intake 2015-2021 WRX

$425.00
$425.00 - $425.00
$425.00
$425.00 - $425.00

DESCRIPTION The GrimmSpeed StealthBox Cold Air Intake System is the result of countless invested hours in research and development to provide the p...

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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!