offs the sky

hello aLL... i need u're help. can i turn off the radio every i drive vehicle? automatic radio make the game moving slow. i was setting the radio becomes "radio off", but that applied only vehicle that only. if I changed other vehicle, radio returns play random and make the game moving slow again. i need trick, setting or something for turn off radio every i drive vehicle. i want to turn off radio permanently every I change vehicle. please help me thanks before... GTA is the best game...!!!