They used a special glassfiber wide bodykit made by Fibresports, larger ventilated front disc brakes retaining the standard drums at the rear, Bilstein gas filled rear dampers and front struts used with single rear leaf springs to maximize efficiency of the dampers, an "anti-dive kit", a Salisbury limited slip differential ( LSD ) and a choice of two performance upgrades for Essex V6 3.0 L engines, the first upgrade called the GP1 or Group 1 pack bumped power up to this engine included larger valves, ported cylinder heads and a Weber 40 DFI5 carburetor and other optional performance upgrades, the second option referred to as Series X or X Pack offered and 195 lb/ft of torque thanks to three Weber 42 DCNF two-barrel carburetors fed by an electric fuel pump, the same ported cylinder heads and larger inlet and exhaust valves as the GP1, and used special head gaskets even though the standard compression ratio of 9.0:1 and standard camshaft were retained.