 Inside, there are Bullitt door sills, gauges, and steering wheel cap, an engine-turned aluminum dash panel, aluminum shift knob and pedals, and GT500-inspired front seats and GT500-inspired steering wheel with black stitching.The first factory Mustang open-element air filter, unique exhaust that mimics the sound of Steve McQueen's GT 390 Fastback and ends in 3.5-inch tips, and new engine programing raise horsepower to 315 (up from 300).A Tremec 5-speed manual and 3.73