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2015-2021 WRX STI Mods

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GrimmSpeed V2 Bypass Valve 2015-2021 WRX

$259.00
$259.00 - $259.00
$259.00
$233.10
$233.10 - $233.10
$233.10

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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Perrin Recirculating Blow Off Valve 2002-2007 WRX / 2004-2021 STI

$278.00
$278.00 - $278.00
$278.00
$208.50
$208.50 - $208.50
$208.50

Adjustable relief pressure and flow control makes fine-tuning on the fly simple and quick with the PERRIN BOV/BPV. HIGH FLOW With large 1.225" inle...

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

$259.00
$259.00 - $259.00
$259.00
$233.10
$233.10 - $233.10
$233.10

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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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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GrimmSpeed Bypass Valve/ Blow Off Valve Gasket 2002-2007 WRX / 2004-2021 STI

$14.00
$14.00 - $14.00
$14.00
$12.60
$12.60 - $12.60
$12.60

DESCRIPTION We all know how bad (and expensive!) the OEM Subaru Top Mount Intercooler Gaskets can be. They are one of the greatest source of leaks ...

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COBB Tuning LF Bypass Valve 2015-2021 WRX

$405.00 - $405.00
$405.00
$405.00 - $405.00
$405.00

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 LF BPV 2002-2007 WRX / 2004-2021 STI

$375.00 - $375.00
$375.00
$375.00 - $375.00
$375.00

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 BPV Adapter for FMIC 2002-2007 WRX / 2004-2021 STI

$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00

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!