https://www.cnet.com/roadshow/news/2019-acura-rdx-a-spec-sema-concept/ > In terms of turning and stopping, the Acura RDX also scores StopTech brakes with six-piston front calipers and new Eibach suspension springs that lower the crossover by two inches. HRE supplied new 21-inch wheels, which are wrapped in Michelin Pilot Sport 4S tires. > From the outside, you'll also spot the RDX A-Spec's exclusive apex blue pearl paint, offset by carbon-fiber mirrors and a carbon-fiber grille, as well as a SEMA-ready graphics wrap package. The cabin has similarly been spruced up for show-car duty, starting with a custom steering wheel and extending to exposed carbon fiber almost everywhere in the cabin. It's a fair bit different than the standard RDX you might buy at your Acura dealership. We'd expect nothing less of a vehicle headed to SEMA, of course.