Here, it is important to note that Formula SAE was NOT a simple renaming of the Mini-Indy competition but was instead an entirely new intercollegiate student engineering design competition. Unlike all previous SAE-sanctioned student racing/design competitions including Mini-Indy, the Formula SAE rules left the selection of the engine to the design team, as long as a 4 stroke engine with a one-inch diameter intake restrictor was used. (The current Formula SAE rules allow the teams to use 4-stroke engines up to 710 cc, with a smaller restrictor.) Also, unlike all previous SAE-sanctioned student racing/design competitions including Mini-Indy, engine modifications were both allowed and encouraged.