I simply put a run of black electrical tape along the window seams on top of the car. If you do it well, it could almost pass as a factory seal. I definitely notice a decrease in wind noise when driving and I suspect that it may add a mile or two of highway range (maybe???). The front is harder to make look good since it is curved. The rear seam is straight and dead easy to make it look okay. As for residue, just use goo-gone and it comes right off. Clean that up with some dish soap. The tape does contract length if you have it slightly stretched when you apply it. Aim to not have much tension on it when you apply it.