Concerning coils, since it is winter, it doesn't make sense to lower the car at least in my opinion. Also some coils aren't rust proof so all that salt during the winter will be bad for it. Just my opinion.
Current: 1987 E30 325is, 1997 E36 M3, 2004 E46 M3, 2015 F80 M3
Past: 2011 E92 M3, 2011 E92 335is, 2008 E90 M3, 2007 E92 335i, 1995 E36 M3