Irish tuning outfit Onyx Concept has unveiled its reworked Bentley GT V8, with the resulting Bentley GTX showcasing a balance between performance and high style. The former is abetted by a twin-turbo 4.0-liter V8 engine that has been boosted to produce 600 horsepower (versus the standard 500 horses), enabling a 0 to 60 mph sprint time of just 4.0 seconds -- an improvement of 0.6 of a second. In terms of retooled design, the GTX is equipped with a widebody kit that includes modified bumpers, revised side skirts and extended wheel arches. Additional revisions include LED daytime running lights, ventilated hood and a four-tailpipe sports exhaust system. Finally, the car has a 10mm reduced ride height, rolling on 22-inch forged alloy wheels. Check out the beauty shots below.