In 19 seasons as Salina Central football coach, Marvin Diener turned the Mustangs into one of the state's premier programs. The Mustangs made nine championship game appearances under Diener and won six state titles in Class 5A.

During his time at Central, Diener set the school mark for wins by a football coach with 170. His teams had an .802 winning percentage (170-42) and went 32-9 in postseason games.

Diener led his team to 15 playoff appearances, including 14 in row from 1992 through 2005. Between 1993 and 2005, the Mustangs won at least 10 games in 12 of 13 seasons. In addition to the nine title game appearances, Central also reached the state semifinals on four other occasions.