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Offered from 1987 to 1991, the RPO-B2K upgrade was available from any Chevrolet dealer and also Callaway's first major Corvette tuning program.

Chevrolet was interested in Reeves Callaway after his successful Alfa V6 tuning and requested a similar program for the fourth generation (C4) Corvette. Together, they made the upgrade package a Regular Production Order (RPO) which was the first time GM had outsourced such an option to a specialist manufacturer. It even had a factory back warranty.

All cars were sent to Callaway's facility in Limerock CT and were outfitted with the Twin Turbo package. The total cost of the upgrade was $19 999 USD which was added to base cost of a coupe ($27 999) or convertible ($33 172).

The B2K option was primarily an engine upgrade, but was comprehensive and used over 2000 new parts. The engine itself got new forged pistons, crankshaft, better lubrication system and four bolt main bearing caps. The induction system required a secondary injection system to retain the original emissions and fuel injection system.

As the C4 updated, so did Callway's program. By 1988, the B2K was pushing 382 bhp and 562 ft. lbs. of torque. This was also met with a price increase which eventually topped out in $33 000 by 1991. Optionally available were 5-Spoke Dymag Wheels.

Later derivatives included the 880 bhp 'Sledgehammer' which went on to reach 254 mph. By the time Callaway stopped the B2K program in 1991, over 500 Corvettes had been converted. It was replaced by the Speedster.

Story by Supercars.net

*Specification Listed for 1987 Coupe Model.