OLM Half Carbon VA Style Rear Diffuser - 2015-2020 WRX / STI Rotors 9 hp and 4

9 hp and 4

and efficiency as your original Ford equipment

as well as displacement over twin tube designs for maximum performance

5°F at the start of a sustained hill climb and still held a 20°F advantage over stock at the end

OLM Half Carbon VA Style Rear Diffuser - 2015-2020 WRX / STI Rotors 9 hp and 4FITS: 2015 2020 Subaru WRX STI The OLM Half Carbon VA Style Rear Diffuser adds a sleek, stylish look to the rear of your 2015 2020 WRX STI. It is precision engineered and made from durable carbon fiber for maximum strength and longevity. Its unique design helps create a powerful aerodynamic effect for maximum acceleration.