No diffuser atleast in the near future. Diffuser doesn´t stop air from getting underneath the car, but rather sucks air from under the car. A diffuser would need a flat belly under the car and much lower ride heigth to work properly. The original gas tank acts kind of like a diffuser though because it rises towards the end of the car. More downforce can be achieved by not letting too much air under the car in the first place. Even though my front wing isn´t that big it made a difference on down force (measured by corner speeds and lap times). Wider front wing plus side skirts and covering the front tires would further increase ground effect, but I don´t think if I´ll ever do those things. I kind of like the looks how it is now.