For next week's SEMA aftermarket show, Scion is set to unveil four FR-S concepts and one outrageous xB Stretch Limo concept. One of the more conspicuous designs features custom touches developed by renowned DJ and producer Steve Aoki, featuring "a fully operational mixing station, a custom Pioneer sound system with multiple component speaker packages, a deck lid-mounted LCD display, a fog machine and strobe lighting," as well as the Aoki's likeness on the exterior. There's also a bulletproof FR-S Concept One built with a wide body and carbon fiber interior, with a 500-horsepower turbocharged engine and a track-tuned suspension. There's even more power in the third FR-S from GReddy Performance, which sports a turbocharged 2JZ-GTE engine capable of 750 horses. Finally, there's the sleek FR-S "Style J," fitted with striking bodykit and custom luxury interior. As for Cartel's stretch limo xB, the vehicle is designed for taking care of business, appointed with on-board Wi-Fi, Apple Mac mini, wireless keyboard with mouse and hands-free mobile calling. Check out detailed looks below.