For true muscle car fanatics with the need for speed, there is a shop in Chicago known as Mr. Norms. It is a speed shop next to Grand Spaulding Dodge, a Mopar dealership that wants to outshine and outsell all the local competition. Mr. Norm is the shop that created the infamous and rare 1971/1972 Dodge Demon GSS. The upgraded car started as the basic Dart Demon 340, but it had some performance parts added by professional builders. The engine received a supercharger and a modified fuel pump and regulator. A blower was added to the hood to ensure the proper air-to-fuel ratio was maintained at every stage of acceleration by offering more air through the intake tubes. The car also came with bigger pulleys, a competition oil pump, heavy-duty valve springs, limited slip differential, and topped it all off by dyno-tuning the engine so it would perform at its best