With a restyled exterior, wider track and custom performance exhaust, the 2005 TSX A-SPEC Concept showcases the potential of Acura's popular sport sedan. The custom exterior boasts restyled front and rear bumpers with improved ventilation and downforce, two-part carbon-Kevlar underbody diffusers, a carbon-Kevlar rear spoiler and widened fenders and sills. The custom exhaust exits at the center of the rear bumper. Track is increased by 20 mm, and 19-in. wheels with a liquid mercury effect paint are wrapped in Pirelli tires. Track performance is enhanced with Acura advanced performance tuned springs and struts and Brembo brakes with four-piston calipers. The interior styling is a combination of aluminum dash and door inserts and carbon-Kevlar panels on the doors and center console. Recaro driver and front passenger seats are finished in leather and suede and compliment the custom gauge cluster, 3-spoke steering wheel and aluminum pedals.
| Powertrain Modifications | Custom high-performance exhaust system |
| Chassis/Suspension Modifications | Acura performance tuned springs and struts with 20 wider track |
| . | Brembo brakes with 4-piston calipers |
| . | Custom 19x8.5 wheels finished with liquid mercury effect paint |
| . | 245/35-19 Bridgestone Potenza S-03 tires |
| Exterior Modifications | Redesigned aero front and rear sport bumpers |
| . | 2-part carbon-Kevlar underbody diffusers |
| . | Carbon-Kevlar rear spoiler |
| . | Widened fenders and side sills |
| . | Steel gray metallic paint |
| Interior Modifications | Aluminum inserts on doors and instrument panels |
| . | Carbon-Kevlar panels on doors and center console |
| . | Recaro driver and front passenger seats finished in leather and suede |
| . | Custom gauge package with red backlighting and aluminum trim |
| . | Custom 3-spoke steering wheel |
| . | Aluminum sport pedals |