edit: Oops, my notes below are for the Opel Calibra Touring Car '94
This is an amazing car, I gave it a "winged it" tune last night on the Nordschleife, applied Praiano's transmission "universal" 6 gear tune, giving it high final gear around 4.300 & closer gear ratios for frequent high rev shifts, set dampers to 4/4 lowered spring rates (this car is only 1000KG, don't forget) Toe -12/+14, camber 1.2/1.6 and Ring around the collar at 6:40 , cannot oversteer it, tires barely even turn white, straight up end stretch at 310km/hr.
takes the toughest of corners around 20-30km/hr faster than cars in same pp range. brake bal 5/7
Chassis and engine rebuild + High Turbo.
Opel Calibra Touring Car '94, definitely feels better than the Vauxhall model.