I actually saw someone that had both - then just took the (in my case) 4 - 1/2 bolts that mounted the windshield off then went for a more aerodynamic affect... I actually spend more time on the street than the track (unfortunately). So I will keep the existing windshield (b/c the passenger has no protection - we will not bring up the issue of not having a full roll bar - that is for married men
).