Mustang at SEMA Obsidian CoupeR Outside the halls of the SEMA show looks like an L.A. expressway during rush hour. A sea of custom cars are double, triple and quadruple parked on sidewalks and access roads. The cumulative effect of so many incredible rides is that it's tough for any single set of wheels to stand out. The Obsidian CoupeR Mustang, however, stood out. It may have been because it was parked in a spot of honor, directly outside a set of main doors in the middle of the pathway with no cars in front, in back or beside it to divert attention. It may also have been its 900 hp, twin-supercharged engine. When a representative of CoupeR Design, the company who built this custom '67 Mustang, would lift the hood, you would think one of the SEMA girls just dropped her top by the size of the crowd that gathered. Everything about this car, however, attracts attention, from the front end that scowls behind a custom air dam and lethal looking hood scoop to the onboard 2.4Ghz computer packing a 60GB hard drive and controlled via a 10.5-inch touchscreen custom installed in the dash, the Obsidian is a particularly obscene example of SEMA-style tuning.