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Subaru STI Engine Parts

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Perrin Brake Reservoir Cover 2002+ WRX/STI

$11.25
$11.25 - $11.25
$11.25
$15.00
$15.00 - $15.00
$15.00

Dress up your engine bay while preventing leaks and spills from your master cylinder reservoir with the PERRIN Brake Reservoir Cozy.  Easy Installa...

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GrimmSpeed Red Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$84.15
$84.15 - $84.15
$84.15
$99.00
$99.00 - $99.00
$99.00

DESCRIPTION The GrimmSpeed Radiator Shroud has been designed to improve the overall cooling efficiency of your vehicle by channeling the incoming a...

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GrimmSpeed Black Lightweight Battery Tiedown 2002+ WRX / 2004-2021 STI

$36.55
$36.55 - $36.55
$36.55
$43.00
$43.00 - $43.00
$43.00

DESCRIPTION Clean up that engine bay and show your GrimmSpeed pride with our newly-designed Subaru Battery Tiedown. Laser cut, then CNC bent and po...

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COBB Tuning Redline Carbon Fiber Fuse Cover 2008-2021 WRX/STI

$205.00
$205.00 - $205.00
$205.00
$205.00 - $205.00

The COBB Redline Carbon Fiber Fuse Cover for the 2008-2021 Subaru WRX/STI is constructed of solid carbon fiber featuring a 2x2 twill weave p...

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GrimmSpeed Titanium 1.3 Bar Radiator Cap 2002-2026 WRX / 2004-2021 STI

$34.85
$34.85 - $34.85
$34.85
$41.00
$41.00 - $41.00
$41.00

DESCRIPTION Upgrade your cooling system with the GrimmSpeed Titanium Radiator Cap, rated at 1.3 bar for improved thermal control and reliability. B...

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COBB Tuning Redline Carbon Fiber Alternator Cover 2008-2014 WRX / 2008-2021 STI

$180.00
$180.00 - $180.00
$180.00
$180.00 - $180.00

The COBB Redline Carbon Fiber Alternator Cover is constructed of 2x2 twill carbon fiber sheet and finished off with a high quality clear coat tha...

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Perrin Red Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$85.50 - $145.50
$85.50 - $145.50
$85.50
$114.00 - $194.00
$114.00 - $194.00
$114.00

The PERRIN Radiator Shroud caps the top of the radiator for a sleek, clean, and accented new look. DESIGN Dress up the top of your radiator with t...

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OLM LE Dry Carbon Fiber Fuse Box Cover 2015-2021 WRX / 2015-2021 STI

$132.00
$132.00 - $132.00
$132.00
$132.00 - $132.00

DESCRIPTION The OLM LE Dry Carbon Fiber Fuse Box Cover was hand crafted with great attention to detail. Each piece is cared for and goes through a ...

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Perrin Neon Yellow Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$105.00 - $161.25
$105.00 - $161.25
$105.00
$140.00 - $215.00
$140.00 - $215.00
$140.00

The PERRIN Radiator Shroud caps the top of the radiator for a sleek, clean, and accented new look. DESIGN Dress up the top of your radiator with t...

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Revel GT Dry Carbon Fuse Box Cover 2008-2021 WRX/STI

$137.75
$137.75 - $137.75
$137.75
$145.00
$145.00 - $145.00
$145.00

ENHANCE INTERIOR Enhance the look of the interior with perfectly fitted dry carbon overlays. Using various methods of extensive testing for eac...

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GrimmSpeed Splatter Red Black V2 Bolt Oil Cap 2002-2026 WRX / 2004-2021 STI

$50.15
$50.15 - $50.15
$50.15
$59.00
$59.00 - $59.00
$59.00

DESCRIPTION It’s inevitable, you’ll eventually want to replace your OEM Subaru oil cap. Whether it's leaking, worn out, or just an eyesore, the Gri...

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GrimmSpeed Neon Green Alternator Cover 2002-2014 WRX / 2004-2021 STI

$84.15
$84.15 - $84.15
$84.15
$99.00
$99.00 - $99.00
$99.00

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...

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GrimmSpeed Red Alternator Cover 2002-2014 WRX / 2004-2021 STI

$84.15
$84.15 - $84.15
$84.15
$99.00
$99.00 - $99.00
$99.00

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...

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GrimmSpeed Black Electronic Boost Control Cover 2008-2021 STI

$52.70
$52.70 - $52.70
$52.70
$62.00
$62.00 - $62.00
$62.00

DESCRIPTION We decided on a subtle design for this cover that mimics the “vent” styling on our matching GrimmSpeed Alternator Cover. Is it made fro...

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GrimmSpeed Black Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$84.15
$84.15 - $84.15
$84.15
$99.00
$99.00 - $99.00
$99.00

DESCRIPTION The GrimmSpeed Radiator Shroud for the 2015-2021 Subaru WRX/STI is made from CNC laser cut and bent aluminum and covered in a very dura...

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COBB Tuning Delrin Oil Cap 2002-2026 WRX / 2004-2021 STI

$95.00
$95.00 - $95.00
$95.00
$95.00 - $95.00

The COBB Delrin Oil Cap's construction of pure medical-grade black Delrin means it does not absorb heat like many aluminum options. The included ...

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Perrin Neon Yellow Oil Cap 2002+ WRX / 2004-2021 STI

$66.00
$66.00 - $66.00
$66.00
$88.00
$88.00 - $88.00
$88.00

Replace the ugly yellow plastic OEM oil fill cap with the sexy billet aluminum PERRIN Oil Fill Cap! Complete Your Engine Bay The Perrin Aluminum O...

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COBB Tuning Radiator Shroud + Alternator Cover Package 2015-2021 STI

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

A quality product with easy installation! This COBB radiator shroud and alternator cover will not only dress up your engine bay but also help dir...

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Perrin Black Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$85.50 - $145.50
$85.50 - $145.50
$85.50
$114.00 - $194.00
$114.00 - $194.00
$114.00

The PERRIN Radiator Shroud caps the top of the radiator for a sleek, clean, and accented new look. DESIGN Dress up the top of your radiator with t...

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IAG Red Revolve Engine Oil Fill Cap 2002-2026 WRX / 2004-2021 STI

$67.99
$67.99 - $67.99
$67.99
$79.99
$79.99 - $79.99
$79.99

TRANSFORM YOUR ENGINE BAY Get rid of the dull yellow plastic under your Subaru’s hood and upgrade your engine bay with the IAG Revolve Engine...

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GrimmSpeed Neon Green Electronic Boost Control Cover 2008-2021 STI

$50.15
$50.15 - $50.15
$50.15
$59.00
$59.00 - $59.00
$59.00

DESCRIPTION We decided on a subtle design for this cover that mimics the “vent” styling on our matching GrimmSpeed Alternator Cover. Is it made fro...

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COBB Tuning Aluminum Alternator Cover 2008-2014 WRX / 2008-2021 STI

$105.00
$105.00 - $105.00
$105.00
$105.00 - $105.00

This alternator shroud is made from 5052-H32 Aluminum, powdercoated wrinkle black, and features a laser etched COBB logo. WHY? A quality pro...

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GrimmSpeed Black Alternator Cover 2002-2014 WRX / 2004-2021 STI

$84.15
$84.15 - $84.15
$84.15
$99.00
$99.00 - $99.00
$99.00

DESCRIPTION Tired of being teased for your corroded alternator and boring engine bay? Step your Alternator Cover game up; GrimmSpeed has just what ...

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Verus Engine Bay Cap Kit 2015-2021 WRX/STI

$232.95
$232.95 - $232.95
$232.95
$232.95 - $232.95

OVERVIEW Cover up the lackluster plastic caps that come on your factory WRX/STI (VA/GR/GV) with a cap machined from solid aluminum.  The caps a...

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Perrin Black Oil Cap 2002+ WRX / 2004-2021 STI

$61.50
$61.50 - $61.50
$61.50
$82.00
$82.00 - $82.00
$82.00

Replace the ugly yellow plastic OEM oil fill cap with the sexy billet aluminum PERRIN Oil Fill Cap! Complete Your Engine Bay The Perrin Aluminum O...

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Perrin Red Oil Cap 2002+ WRX / 2004-2021 STI

$61.50
$61.50 - $61.50
$61.50
$82.00
$82.00 - $82.00
$82.00

Replace the ugly yellow plastic OEM oil fill cap with the sexy billet aluminum PERRIN Oil Fill Cap! Complete Your Engine Bay The Perrin Aluminum O...

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COBB Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$125.00
$125.00 - $125.00
$125.00
$125.00 - $125.00

EMISSIONS This part is not an emissions-related part and therefore can be used on Emission Controlled Vehicles. DESCRIPTION This radiator s...

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APR Performance Carbon Fiber Alternator Cover 2008-2014 WRX / 2008-2021 STI

$123.20
$123.20 - $123.20
$123.20
$154.00
$154.00 - $154.00
$154.00

Dress-up the engine bay with carbon fiber, molded to precise dimensions that only pre-preg. materials can achieve.  These parts are exotic-looking,...

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GrimmSpeed Black Engine Bay Dress-Up Caps 2002-2021 WRX / 2004-2021 STI

$55.25
$55.25 - $55.25
$55.25
$65.00
$65.00 - $65.00
$65.00

DESCRIPTION The GrimmSpeed Engine Bay Cap Set completely replaces the OEM yellow caps under the hood of all 2008-21 WRX and STI models, as well as ...

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IAG Red Revolve Coolant Reservoir Cap 2002-2026 WRX / 2004-2021 STI

$42.49
$42.49 - $42.49
$42.49
$49.99
$49.99 - $49.99
$49.99

TRANSFORM YOUR ENGINE BAY Get rid of the unattractive OEM yellow cap and upgrade your engine bay with the IAG Revolve Coolant Reservoir Cap. ...

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GrimmSpeed Titanium Alternator Shroud 2002–2014 WRX / 2004–2021 STI

$148.75
$148.75 - $148.75
$148.75
$175.00
$175.00 - $175.00
$175.00

DESCRIPTION Upgrade your EJ engine bay with the GrimmSpeed Titanium Alternator Shroud for the 2002–2014 WRX and 2004–2021 STI. Designed for enthusi...

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Perrin Hyper Pink Oil Cap 2002+ WRX / 2004-2021 STI

$66.00
$66.00 - $66.00
$66.00
$88.00
$88.00 - $88.00
$88.00

Replace the ugly yellow plastic OEM oil fill cap with the sexy billet aluminum PERRIN Oil Fill Cap! Complete Your Engine Bay The Perrin Aluminum O...

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Perrin Hyper Pink Radiator Shroud 2015-2021 WRX / 2015-2021 STI

$105.00 - $161.25
$105.00 - $161.25
$105.00
$140.00 - $215.00
$140.00 - $215.00
$140.00

The PERRIN Radiator Shroud caps the top of the radiator for a sleek, clean, and accented new look. DESIGN Dress up the top of your radiator with t...

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IAG Silver Revolve Engine Oil Fill Cap 2002-2026 WRX / 2004-2021 STI

$67.99
$67.99 - $67.99
$67.99
$79.99
$79.99 - $79.99
$79.99

TRANSFORM YOUR ENGINE BAY Get rid of the dull yellow plastic under your Subaru’s hood and upgrade your engine bay with the IAG Revolve Engine...

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IAG Black Revolve Engine Oil Fill Cap 2002-2026 WRX / 2004-2021 STI

$67.99
$67.99 - $67.99
$67.99
$79.99
$79.99 - $79.99
$79.99

TRANSFORM YOUR ENGINE BAY Get rid of the dull yellow plastic under your Subaru’s hood and upgrade your engine bay with the IAG Revolve Engine...

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IAG Blue Revolve Engine Oil Fill Cap 2002-2026 WRX / 2004-2021 STI

$67.99
$67.99 - $67.99
$67.99
$79.99
$79.99 - $79.99
$79.99

TRANSFORM YOUR ENGINE BAY Get rid of the dull yellow plastic under your Subaru’s hood and upgrade your engine bay with the IAG Revolve Engine...

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Your Subaru STI was built for excitement, but why settle for stock when you can achieve so much more? WRXDaily’s premium Subaru STI engine parts help you unlock the raw potential of your car. Turn your track days or daily drives into unbeatable experiences.

Whether you’re aiming for peak efficiency or high-octane power, our Subaru WRX STI engine upgrades deliver solutions tailored to your goals. For even greater customization, explore our range of Subaru STI aftermarket performance parts crafted to elevate every aspect of your engine’s performance.

Every part we offer is precision-engineered for seamless integration and maximum impact. From reliable endurance to thrilling power gains, these parts are made to perform. Don’t wait to transform your Subaru into the ultimate performance machine; start your build with WRXDaily’s expertly crafted parts today.