Subaru Hot Rods APR Carbon Fiber Wind Splitter w Rods Fits 08 10 Subaru STI PREracing APR Carbon Fiber Front Wind Splitter for 2018 2021 WRX STi APR Carbon Fiber Wind Splitter for 15 17 STi (CW 801506). To combat the effects of front end lift, APR Front Wind Splitters are utilized to give extra traction and control in the front of your 2018 2021 Subaru Impreza WRX STI. By creating a high pressure area on top of the wind splitter, high pressure air flow is restricted to flow underneath a car. With low pressure below the car, the effect of lift is reduced and a driver can gain from the extra traction and control. Made to order 2 week build time Features: Carbon Fiber Reinforcement All APR Front Wind Splitters are reinforced with sheets of carbon fiber. Fully Functional Undertray Our Front Wind Splitters are not just add on cosmetic pieces. Every APR Front Wind Splitter completely covers the entire area below a cars front bumper. This allows for smoother air flow below the front bumper, creating more efficient downforce. Support Rods Included Supporting every APR Front Wind Splitters are stainless steel Support Rods.