I don't think that diffuser is allowed under the rules. I'm not all that familiar with them but I recall that you're not allowed see anything through them. I can't remember the wording but the jist is that you have to make it so you can't see sky (from underneath/in-front) or tarmac (from above/behind).
Can someone with greater knowledge clarify? Please
Good work so far =D> Open-Sourced forum car...this could work. The F1T car is a step closer

"It could be done manually. It would take quite a while, but it could be done. There is however a much more efficient and accurate way of getting the data. Men with lasers." Wing Commander Andy Green