Started out as a stock "all Euro spec" W107 450SLC. High compression, no emissions, lower variable rate springs all four corners, 4 speed manual transmission, lighter manual windows, no AC, aluminum hood, small lighter bumpers and 17 inch wheels and wide sticky tires. I replaced the rear diff with a 3.55 ratio was 2.89. Lightened exhaust (center muffler deleted). It smokes the tires, but fuel economy is not the best!