The HPD ARX-03 is one of the Honda entries the open record knows by name, and by little else. That is not nothing: a name in the catalogue is where a car's story starts to be recoverable. Its designer of record is Nick Wirth.
The background
The HPD ARX-03a, ARX-03b, and ARX-03c are Le Mans Prototypes race cars developed by Honda Performance Development in 2012. The 03a model utilizes a Honda V8 engine for use in the LMP1 category, while the 03b uses a turbocharged V6 engine for the LMP2 category.
Three teams have already announced their use of the ARX-03 in the FIA World Endurance Championship and the American Le Mans Series, as well as at the 24 Hours of Le Mans. Muscle Milk Pickett Racing have purchased an 03a for use in the American Le Mans Series, joined by two 03bs for Level 5 Motorsports. In the 2012 FIA World Endurance Championship, Strakka Racing and JRM Racing campaigned a single 03a each, joined by a single-car 03b entry by Starworks Motorsport in LMP2.
The engineering
it is rated at NNN hp. Kerb weight is 900 kg. The wheelbase is NNNN mm. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
Where it sits in Honda's history is not in doubt: the Acura ARX-01, Acura ARX-02 came before it; the HPD ARX-04b followed it. Its Honda stablemates include the Honda Envix and the Honda Crider.