Further enhancements were made for 1984, most notably the addition of an air-to-air intercooler allowing the compression ratio to be increased from 8.0:1 to 8.5:1 with revised turbocharger exhaust housing to the FJ20ET powered model increasing output to of power at 6,400 rpm (gross) and of torque at 4,400 rpm. The intercooled model was nicknamed the "Turbo C". The "Turbo C" formed the basis for the Super Silhouette race car built by GT-R Works and sponsored by Tomica and run in the All Japan Sports Prototype Championship under FIA Group C regulations.