The Mazdas were required to be muffled in the paddock, which meant people took a large street muffler and stuck it over the exhaust, which meant you had something like three feet of muffler trailing around behind.
The most painful car in my experience was an IMSA RS Cosworth Vega. It knocked me off the pit wall and caused serious pain, when it went past at redline. Nothing else has ever come close to that, including open pipe two stroke Maicos in a small shed.
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