Hello Emmanuel, Sounds like your design works fine. The proof of the pudding is in the temperature, well done! If the air is being discouraged from building pressure under the car, the front end stability should also be improved. I like the sound of Rheinubung's black lexan spoiler. It would be great to mill slots in the spoiler for the mounting screws, so the height can be adjusted. He could start with 1'' and test temp and stability. Then increase to 2'' and even 3'' to see if it improves or not. The sort of testing I love to do. Let me know how you get on. Regards, Andy.