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2021 Subaru STI

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Forged Carbon Shift Knob - Height Adjustable M12x1.25mm
Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

$159.00

Unit price
per 

2 color optionss
  • Anodized Red
  • Anodized Black
Paragon Accessport Vent Mount - 15-21' WRX/STi and 14-18' SJ
Paragon Accessport Vent Mount - 15-21' WRX/STi and 14-18' SJ
Sale
Multiple Applications

Paragon Accessport Vent Mount - 15-21' WRX/STi and 14-18' SJ

Regular price from $119.00

Unit price
per 

3 colors
  • Anodized Black
  • Anodized Red
  • Anodized Silver
SmartFlow Shroud
SmartFlow Shroud
Best Seller

SmartFlow Radiator Shroud for 2015-2021 WRX/STI

$285.00

Unit price
per 

5 color optionss
  • White Hot
  • Neon Yellow
  • Wrinkle Red
  • Wrinkle Black
  • Anodized Silver
Airblades 2.0
Airblades 2.0

Airblades 2.0 Radiator Shrouds 2015-2021 WRX / 2014-2018 Forester

$199.00

Unit price
per 

5 color optionss
  • Neon Yellow
  • Wrinkle Red
  • Wrinkle Black
  • White Hot
  • Silver
Dynamic Forged Carbon Shift Knob - Height Adjustable M12x1.25mm
Dynamic Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

Dynamic Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

$169.00

Unit price
per 

2 color optionss
  • Blue Forged
  • Red Forged
Engine Dress-up Clips
Engine Dress-up Clips

Engine Dress-up Clips fits most Subaru Models

from $25.00

Unit price
per 

2 clip sets
STI Fender Vent
STI Fender Vent
Red Forged Carbon Shift Knob - Height Adjustable M12x1.25mm
Red Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

Red Forged Carbon Shift Knob - Height Adjustable M12x1.25mm

$169.00

Unit price
per 

3 color optionss
  • 6 Speed Reverse Left Up
  • 6 Speed Reverse Right Down
  • 5 Speed
Compressive Tuning Original M6 Dress-Up Bolts 10pc-kit
Compressive Tuning Original M6 Dress-Up Bolts 10pc-kit

Compressive Tuning Original M6 Dress-Up Bolts 10pc-kit

$49.00

Unit price
per 

3 colors
  • Anodized Red
  • Anodized Black
  • Anodized Blue
Engine Dress-up Clips for 15-21' WRX/STI (25 pc Complete Kit)
Engine Dress-up Clips for 15-21' WRX/STI (25 pc Complete Kit)

Engine Dress-up Clips for 15-21' WRX/STI (25 pc Complete Kit)

$110.00

Unit price
per 

3 color optionss
  • Anodized Blue
  • Anodized Black
  • Anodized Red
STI Louvre Cover - 08' + STI
STI Louvre Cover - 08' + STI

STI Louvre Cover for 2008-2010 STI, 2011-2014 STI, 2015-2021 STI

$225.00

Unit price
per 

5 color optionss
  • Wrinkle Red
  • Wrinkle Black
  • White Hot
  • Silver
  • Neon Yellow
Compressive Tuning Holographic Stickers
Compressive Tuning Holographic Stickers
Sale

Compressive Tuning Holographic Stickers

Regular price from $10.00

Unit price
per 

Forged Carbon Limited Edition Shift Knob - Matte Carbon Finish
Limited
New

Enhance Your 2021 Subaru WRX STI with Performance and OEM Upgrades

Designed specifically for the 2021 Subaru WRX STI, this collection offers a comprehensive range of parts to elevate your car’s power, handling, and reliability. Whether you’re aiming for aggressive performance gains or maintaining your STI’s precision engineering, our selection covers everything from turbochargers to suspension components.

What Are the Key Performance Upgrades for the 2021 WRX STI?

Upgrading your 2021 WRX STI starts with components that directly impact power delivery and driving dynamics. Popular upgrades include intake and exhaust systems that improve airflow, turbochargers that enhance boost response, and suspension parts that sharpen handling. Supporting modifications like brakes and drivetrain components ensure your STI remains balanced and reliable under increased performance demands.

  • Turbochargers and intercoolers for improved boost and heat management
  • Coilovers and sway bars to refine cornering and chassis control
  • High-performance brakes for consistent stopping power
  • Engine management tools for precise tuning and monitoring

How to Choose the Right Parts for Your 2021 STI Build

Selecting the right upgrades depends on your goals, whether it’s daily driving, spirited canyon runs, or track use. Consider your power targets, budget, and how each part integrates with your existing setup. OEM replacement parts are essential for maintaining reliability, while aftermarket components offer performance gains. Always factor in tuning requirements and compatibility to maximize the benefits of your upgrades.

Where to Find Trusted Parts and Upgrades for Your 2021 WRX STI

At Compressive Tuning, we specialize in Subaru-focused performance and OEM parts tailored for the 2021 WRX STI. Our curated selection ensures quality, fitment, and real-world results. Whether you’re upgrading your turbo system, suspension, or drivetrain, explore our collection to find the right components to enhance your STI’s performance and driving experience.

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