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2015-2021 WRX & STI Mods

IAG 550 Long Block Engine w/ IAG 550 Heads 2002-2014 WRX / 2004-2021 STI

$9,999.99 - $10,299.99
$9,999.99 - $10,299.99
$9,999.99
$9,999.99 - $10,299.99

A "DROP-IN" SOLUTION The IAG Performance Hand-Built 550 Subaru EJ25 Long Block Packages are a complete, valve cover to valve cover...

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IAG 750 Closed Deck Long Block Engine w/ IAG 750 Heads 2002-2014 WRX / 2004-2021 STI

$12,749.99 - $12,999.99
$12,749.99 - $12,999.99
$12,749.99
$12,749.99 - $12,999.99

A "DROP-IN" SOLUTION The IAG Performance Hand-Built Subaru EJ25 Closed Deck Long Block Engine Packages are a complete, valve cover t...

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IAG 950 Closed Deck Long Block Engine w/ IAG 950 Heads 2002-2014 WRX / 2004-2021 STI

$13,999.99 - $14,299.99
$13,999.99 - $14,299.99
$13,999.99
$13,999.99 - $14,299.99

A "DROP-IN" SOLUTION The IAG Performance Hand-Built Subaru EJ25 Closed Deck Long Block Engine Packages are a complete, valve cover t...

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IAG Performance Stage X Short Block 2002-2014 WRX / 2004-2021 STI

$17,999.99
$17,999.99 - $17,999.99
$17,999.99
$17,999.99 - $17,999.99

The CNC Billet Aluminum EJ case seeks to change the Subaru performance tuning market by reinventing the EJ and addressing virtually every weakness ...

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Brembo Front 4 Piston 328mm Race Brakes 2005-2021 STI

$4,395.00
$4,395.00 - $4,395.00
$4,395.00
$4,395.00 - $4,395.00

NASA, SCCA, POC, PCA, Time Attack For popular track oriented cars which meet or exceeds the requirements of numerous sanctioning bodies such as SCC...

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ACT Mod Twin 225 Xtreme Duty Sprung Race Twin Disk Clutch Kit 2004-2021 STI

$2,095.00
$2,095.00 - $2,095.00
$2,095.00
$2,586.00
$2,586.00 - $2,586.00
$2,586.00

DESCRIPTION The ACT Mod Twin 225 Xtreme Duty Sprung Race Twin Disk Clutch Kit for the 2004-2021 STI is built for high-powered AWD applications that...

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ACT Mod Twin 225 Xtreme Duty Rigid Street Twin Disk Clutch Kit 2004-2021 STI

$1,955.00
$1,955.00 - $1,955.00
$1,955.00
$2,413.00
$2,413.00 - $2,413.00
$2,413.00

DESCRIPTION The ACT Mod Twin 225 Xtreme Duty Rigid Street Twin Disk Clutch Kit for the 2004-2021 STI is designed for high-powered AWD street builds...

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ACT Mod Twin 225 Heavy Duty Sprung Race Twin Disk Clutch Kit 2004-2021 STI

$2,104.00
$2,104.00 - $2,104.00
$2,104.00
$2,598.00
$2,598.00 - $2,598.00
$2,598.00

DESCRIPTION The ACT Mod Twin 225 Heavy Duty Sprung Race Twin Disk Clutch Kit for the 2004-2021 STI is engineered for high-powered AWD applications ...

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ACT Mod Twin 225 Heavy Duty Rigid Street Twin Disk Clutch Kit 2004-2021 STI

$1,929.00
$1,929.00 - $1,929.00
$1,929.00
$2,381.00
$2,381.00 - $2,381.00
$2,381.00

DESCRIPTION The ACT Mod Twin 225 Heavy Duty Rigid Street Twin Disk Clutch Kit for the 2004-2021 STI is built for high-powered AWD street and street...

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ACT Mod Twin 225 Heavy Duty Rigid Race Twin Disk Clutch Kit 2004-2021 STI

$2,047.00
$2,047.00 - $2,047.00
$2,047.00
$2,527.00
$2,527.00 - $2,527.00
$2,527.00

DESCRIPTION The ACT Mod Twin 225 Heavy Duty Rigid Race Twin Disk Clutch Kit for the 2004-2021 STI is built for high-powered AWD race applications t...

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ACT Heavy Duty Sprung 4-Puck Disc Clutch Kit 2004-2021 STI

$827.00
$827.00 - $827.00
$827.00
$1,021.00
$1,021.00 - $1,021.00
$1,021.00

DESCRIPTION The ACT Heavy Duty Sprung 4-Puck Disc Clutch Kit for the 2004-2021 STI is designed for high-horsepower street and race applications tha...

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ACT Heavy Duty 6-Puck Disc Clutch Kit 2004-2021 STI

$861.00
$861.00 - $861.00
$861.00
$1,063.00
$1,063.00 - $1,063.00
$1,063.00

DESCRIPTION The ACT Heavy Duty 6-Puck Disc Clutch Kit is engineered for the 2004–2021 Subaru STI and is designed to handle high horsepower street a...

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Verus Engineering Aggressive Rear Diffuser 2015-2021 WRX/STI

$829.95
$829.95 - $829.95
$829.95
$829.95 - $829.95

OVERVIEW The Verus Engineering Aggressive Rear Diffuser combines function, form, and science to deliver unparalleled fit, performance, and style t...

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Remark 3.5" Burnt Stainless Double Wall SPT Axleback 2015-2021 WRX/STI

$545.00
$545.00 - $545.00
$545.00
$545.00 - $545.00

Got an SPT exhaust system on your Subaru WRX/STI VA?  Upgrade with a REMARK Axleback system for your Subaru  SPT WRX/STI VA today! 

Remark Boso Edition Burnt Blue Axleback 2015-2021 WRX/STI

$565.00
$565.00 - $565.00
$565.00
$565.00 - $565.00

They are the outlaws of Japan, and known as the "Violent Speed Gang".The outrageous styling, and designs of their JDM vehicles are very iconic with...

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Remark Boso Edition Burnt Stainless Steel Axleback 2015-2021 WRX/STI

$795.00
$795.00 - $795.00
$795.00
$795.00 - $795.00

They are the outlaws of Japan, and known as the "Violent Speed Gang".The outrageous styling, and designs of their JDM vehicles are very iconic with...

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Remark 4" Stainless Double Wall Axleback 2015-2021 WRX/STI

$695.00
$695.00 - $695.00
$695.00
$695.00 - $695.00

Direct bolt-on easy installation to the factory OEM or Remark mid Y-pipe (Please note : this product will NOT fit aftermarket exhaust system)

Remark 3.5" Burnt Stainless Single Wall Axleback 2015-2021 WRX/STI

$695.00
$695.00 - $695.00
$695.00
$695.00 - $695.00

Direct bolt-on easy installation to the factory OEM or Remark mid Y-pipe (Please note : this product will NOT fit aftermarket exhaust system)

Remark 3.5" Burnt Stainless Double Wall Axleback 2015-2021 WRX/STI

$715.00
$715.00 - $715.00
$715.00
$715.00 - $715.00

Direct bolt-on easy installation to the factory OEM or Remark mid Y-pipe (Please note : this product will NOT fit aftermarket exhaust system)

Remark 3.5" Stainless Double Wall Axleback 2015-2021 WRX/STI

$655.00
$655.00 - $655.00
$655.00
$655.00 - $655.00

Direct bolt-on easy installation to the factory OEM or Remark mid Y-pipe (Please note : this product will NOT fit aftermarket exhaust system)

Remark 3.5" Stainless Single Wall Axleback 2015-2021 WRX/STI

$595.00
$595.00 - $595.00
$595.00
$595.00 - $595.00

Direct bolt-on easy installation to the factory OEM or Remark mid Y-pipe (Please note : this product will NOT fit aftermarket exhaust system)

Remark Strut Tower Brace 2015-2021 WRX/STI

$265.00
$265.00 - $265.00
$265.00
$265.00 - $265.00

Weight - 2.0lbs Material - Full T304 Stainless Steel Manufacture - Tig-welded and fabricated by hand Style - Brushed finished

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SPL Rear Adjustable Lower Control Arms 2008-2026 WRX / 2008-2021 STI

$692.10
$692.10 - $692.10
$692.10
$769.00
$769.00 - $769.00
$769.00

SPL adjustable Rear Lower Camber Arms (RLL) for the GR86/BRZ/WRX allow for adjustable camber, track, and installed motion ratios while significantl...

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South Bend Clutch Stage 3 Endurance Clutch Kit 2004-2021 STI

$1,263.83
$1,263.83 - $1,263.83
$1,263.83
$1,302.92
$1,302.92 - $1,302.92
$1,302.92

Southbend Clutch Kits are considered to be one of the most comfortable high-performance clutch kits on the market due to the OEM-like feel and driv...

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AEM Electronics CD-7LG Carbon Logging Display w/ GPS

$2,151.95
$2,151.95 - $2,151.95
$2,151.95
$2,420.95
$2,420.95 - $2,420.95
$2,420.95

CD-7LG CARBON DIGITAL DASH DISPLAY SPECS: Full color 7" screen with 800x480 resolution Direct sunlight readable (1000cd/m2 brightness and anti-gla...

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APR Carbon Fiber Front Splitter Stock Bumper 2015-2017 WRX/STI

$539.10
$539.10 - $539.10
$539.10
$599.00
$599.00 - $599.00
$599.00

To combat the effects of front end lift, APR Front Wind Splitters are utilized to give extra traction and control in the front of a car. By creatin...

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Invidia N1 Stainless Tip Single Exit Exhaust 2015-2021 WRX / 2015-2021 STI

$1,055.75
$1,055.75 - $1,055.75
$1,055.75
$1,587.60
$1,587.60 - $1,587.60
$1,587.60

DESCRIPTION The Invidia N1 Single Exit Cat-Back Exhaust System with Stainless Steel Tip is a high-performance upgrade tailored for 2015-2021 Subaru...

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Invidia Q300 Resonated Single Exit Catback 2015-2021 WRX / 2015-2021 STI

$1,107.89
$1,107.89 - $1,107.89
$1,107.89
$1,666.00
$1,666.00 - $1,666.00
$1,666.00

DESCRIPTION The Invidia Q300 Single Exit Cat-Back Exhaust System with Stainless Steel Tip is a premium performance upgrade for 2015-2021 Subaru WRX...

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Invidia N1 Stainless Tip Dual Catback Exhaust 2015-2021 WRX / 2015-2021 STI

$1,205.64
$1,205.64 - $1,205.64
$1,205.64
$1,813.00
$1,813.00 - $1,813.00
$1,813.00

DESCRIPTION The Invidia N1 Cat-Back Exhaust System with Stainless Steel Tips is the ultimate upgrade for 2015-2021 Subaru WRX and STI enthusiasts. ...

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Invidia Racing Full Titanium Single Exit Catback Exhaust 2015-2021 WRX / 2015-2021 STI

$1,398.36
$1,398.36 - $1,398.36
$1,398.36
$2,102.80
$2,102.80 - $2,102.80
$2,102.80

DESCRIPTION The Invidia Full Titanium Cat-Back Exhaust System is the pinnacle of performance and design for 2015-2021 Subaru WRX and STI models. Cr...

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Tein Mono Sport Coilovers 2015-2021 WRX/STI

$1,890.50
$1,890.50 - $1,890.50
$1,890.50
$1,990.00
$1,990.00 - $1,990.00
$1,990.00

New for 2015, this particular model of the Tein Mono Sport Coilovers is designed to greatly reduce body roll compared to the factory setup. The res...

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Tein RX1 Coilovers 2015-2021 WRX/STI

$1,472.50
$1,472.50 - $1,472.50
$1,472.50
$1,550.00
$1,550.00 - $1,550.00
$1,550.00

Highlights: Full-Length Ride Height Adjustment Feature - Ride Height Adjustment with Little or No Change in Ride Quality. Twin-Tube Structure - Fo...

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AEM Front Strut Tower Bar Wrinkle Red 2015-2021 WRX/STI

$346.99
$346.99 - $346.99
$346.99
$346.99 - $346.99

When a car equipped with a McPherson Strut suspension system, like the 2015 Subaru WRX 2.0L or WRX STi 2.5L, is being driven through a turn there i...

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Cusco Adjustable Rear Trailing Rods 2015-2021 WRX/STI

$513.00
$513.00 - $513.00
$513.00
$570.00
$570.00 - $570.00
$570.00

Cusco's rear trailing arm controls unwanted force under acceleration and braking. Cusco's adjustable pillowball trailing arms prevents unwanted whe...

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Corsa Performance Catback Exhaust Polished Tips 2015-2021 WRX/STI

$1,856.99
$1,856.99 - $1,856.99
$1,856.99
$1,856.99 - $1,856.99

Here, you are looking at the Corsa Performance 3-Inch Dual Rear Exit Catback Exhaust System with Twin 3.5-inch Tips. This exhaust system has been d...

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Corsa Performance Catback Exhaust Polished Black Tips 2015-2021 WRX/STI

$1,928.99
$1,928.99 - $1,928.99
$1,928.99
$1,928.99 - $1,928.99

Here, you are looking at the Corsa Performance 3-Inch Dual Rear Exit Catback Exhaust System with Twin 3.5-inch Tips. This exhaust system has been d...

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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!