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From my understanding it's gonna be a pretty bad idea for you to install a viper system or another aftermarket system. You have all the electronics/computer to deal with and BMWs just don't do well with these installed. Also, it's bad to let your M3/M4 just sit and idle to warm up because of the carbon deposits that will build up. The best way is to get in and drive. I live in MN so trust me I know how you feel but these cars warm up quick! Plus the heated steering wheel and seats are always a bonus.
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