 On December 29, 2011 KFNS-FM changed formats once gain, this time to Hot Adult Contemporary, also as "Westplex 100.7".On December 27, 2012 KFNS-FM changed their format to Active Rock, branded as "The Viper".As 100.7 The Viper, KFNS-FM has grown the audience size to new levels according to St Louis area magazine "Full Throttle", and has become one of the most-listened to stations in the Westplex, as the December 2014 issue reported on the growth in listenership for "100.7 The Viper".