Check out the latest new edition of Mopar Muscle magazine... one of our AX/HPDE comrad's car is featured (Rick Guisto)... his '71 Challenger as it was running at the recent Spring Fling at Willow Springs Raceway, S/Cal. His spoiler is from the Cudapsoilerguy.com (Jon). I bought 2 of those (w/o ducts).. intending to mount one onto a spare front valence... next season for 2017. These are functional at high speeds. the only draw-back is to slip a floor jack underneath the front... I may cut/make a flap of the spoiler... hinged/buttoned.. with DODGE... so to fit a floor jack underneath.... just an idea for the time being.... also to add rear braces under the spoiler spaced about ~12" apart.