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Verus Engineering Carbon Thermoplastic Side Splitter Winglet 15-18 WRX / 15-18 STI Verus Engineering Front Splitter Support System 15-18 WRX / 15-18 STI APR Performance License Plate Backing (15 - 18 WRX / STi)
Helps with creating more downforce Helps with supporting the front splitter Dress-up your exterior
OLM Carbon Fiber Gurney Flap for STI Spoiler 15-20 WRX / 15-20 STI Verus Engineering Composite Rear Spat Kit 15-18 WRX / 15-18 STI OLM ATAK Carbon Fiber Roof Spoiler 15-20 WRX / 15-20 STI
Fits edge of rear wing

Helps with reducing drag Quick installation
APR Performance Trunk Garnish (15 - 18 WRX / STi) Carbon Reproductions RS Style Gurney Flap for STI Spoiler 2015-2020 STI Verus Engineering Rear Suspension Covers 15-18 WRX / 15-18 STI
Dress-up your exterior Sits on edge of wing Helps with reducing drag
APR Performance Front Bumper Canards (15 - 17 WRX / STi) APR Performance Front Bumper Canards (2018 WRX / STi) Verus Engineering Front Splitter 15-18 WRX / 15-18 STI
Increase front downforce Increase front downforce Helps with creating more downforce
APR Performance Exhaust Heat Shield (2015 WRX / STi) Verus Engineering 2 Piece Front Splitter 15-18 WRX / 15-18 STI APR Performance Vortex Generator (15 - 18 WRX / STi)
Dress-up your exterior Helps with creating more downforce Increase effectiveness of rear wing
APR Performance Rear Bumper Skirts (15 - 18 WRX / STi) APR Performance Formula GT3 Mirrors (15 - 18 WRX / STi) OLM S208/S209 Style Spoiler Gloss Black - Subaru WRX / STI 2015+
Reduce lift Reduce drag Includes hardware
OLM VA Style Carbon Fiber Front Lip - Subaru 18-21 WRX / 18-21 STI APR Performance Brake Cooling Ducts (15 - 17 WRX / STi) APR Performance Factory Lip Front Wind Splitter (2018 WRX / STi)
18+ Fitment Keep your brakes cool Reduce lift
APR Performance Stock Bumper Front Wind Splitter (15 - 17 STi) APR Performance Lip Front Wind Splitter (15 - 17 WRX / STi) APR Performance Factory Lip Front Wind Splitter (15 - 17 WRX / STi)
Support rods included Support rods included Support rods included
APR Performance Stock Bumper Front Wind Splitter (2018 WRX / STi) Verus Engineering Agressive Rear Diffuser 15-18 WRX / 15-18 STI Verus Engineering Non-Agressive Rear Diffuser 15-18 WRX / 15-18 STI
Reduce lift Helps with downforce and drag Helps with downforce and drag
APR Performance Brake Cooling Kit (15 - 17 STi) APR Performance Front Air Dam (15 - 17 WRX / STi) APR Performance Front Air Dam (2018 WRX / STi)
Keep your brakes cool Reduce lift Reduce lift