As being a SR-71, known to be only handful ever made, was produced to beat the Callaway Corvette in 1991. This rare beast, from factory was known to output 464 horsepower, with 400 lbs. ft. torque at 4000 rpm with the boost set at 17 psi using 92 octane . With 105 octane fuel, however, HKS dyno tested the SR-71 with over 500 horsepower with 464 lbs. ft. torque pulling at 6500 rpm. The SR-71 "package" was put together by Motorsport International in Waco, TX. The engineering of the SR-71 was done by HKS which included the intercoolers, new bearings, rings, HKS special tuned electronic struts, and street-legal free flow exhaust.
This particular vehicle was later built with engine upgrades which include:
larger turbos, ceramic turbo manifolds, HKS race cams, Je pistons, Crowler rods, steel crank, ported and polished heads, Jim Wolf ECU, 740 minute injectors, Megan Racing downpipe, HKS street axle back, and Turbo XS blow off valves, Autometer boost and volt gauge, Greddy turbo timer
Wheels are 17" factory gold BBS wheels wrapped with Goodyear 245/40/17 and 275/40/17 tires
The interior is cloth/tweed, which came standard in the twin-turbo SR-71 from factory