Based on the TSX sport sedan, the one-of-a-kind A-SPEC Concept is aggressively styled with wide fenders, custom 19-inch wheels and Pirelli tires that combine to increase the track by 20 mm. The front and rear fascias have been redesigned for improved ventilation and downforce. Air is directed under the car with two-part carbon-Kevlar underbody diffusers and the new rear bumper incorporates dual center-mounted exhaust pipes. On the trunk is a custom carbon-Kevlar rear spoiler. The side sills are extended and the headlights and taillights are revised to blend with the A-SPEC Concept's unique styling. Suspension changes include A-SPEC performance springs and shocks along with oversize Brembo brakes. These track-tuned pieces are designed to enhance the TSX's handling in demanding conditions. The custom exhaust and intake systems combine to increase horsepower and torque and give the TSX A-SPEC Concept thrilling engine and exhaust notes.

Inside, the TSX A-SPEC Concept boasts race-ready Recaro seats. The front and rear seats are upholstered in premium black leather with suede inserts. Aluminum accents on the dash, steering wheel and shifter combine with carbon-Kevlar panels on the doors and center console for a high-tech, purposeful look. The RSX Concept first made its debut at the 2001 SEMA show and is updated to reflect the significant changes made to the Acura RSX for 2005. The Concept RSX features a chassis that has been widened five inches compared to stock, with an aggressive body styling kit, fender flares, carbon fiber front and rear spoilers and HID headlights. It boasts racecar suspension tuning, large 19-inch "black chrome" wheels, prototype Michelin F1 tires and Brembo brakes. Inside, fully customized interior features carbon fiber accents, a race-style instrument panel and custom gauge cluster.

Also on display is the 2005 RL A-SPEC Concept, which debuted at the North American International Auto Show in Detroit earlier in 2005. The RL A-SPEC Concept is extensively modified to showcase the next level of A-SPEC performance accessories for Acura's flagship sedan. The concept features an exterior resculpted with restyled front and rear bumpers, rocker panels, an integrated trunk spoiler, side sills and fender flares. Custom 20-inch wheels increase the track by 30 mm over stock. The RL A-SPEC Concept also includes track-tuned shocks and springs that lower the car by one inch to enhance its handling, and Brembo brakes on all four corners that improve stopping power. Inside is a hand-stitched leather interior with a two-tone Alcantaraú headliner and blonde Birchwood accents.

The 2004 TL A-SPEC Concept on display at SEMA debuted at the Greater Los Angeles Auto Show in 2004. The TL A-SPEC concept features custom front and rear fascias, 21-inch alloy wheels with high performance tires and a race-inspired cockpit. The panoramic glass roof provides a stunning view and the custom intake, exhaust and race-tuned suspension and brakes combine for stunning performance.