Has any one changed their comand head unit. I have a 2003 sl500 and am going to replace my factory head unit with an alpine piece. I changed all my speakers in car with focal utopia spekers , and aded 3 8 inch JL audio W7 all powerd by zapco amps. so everithing should sound great. but im runing into problems with factory head unit doing all kind of modifications to sound and im geting distorted sound. we tried using a aftermarket radio and wow did it sound great, so regretebly will have to change comand for alpine. Dont realy wat to do this. any sugestions???????????