Just got my Alpine upgrade kit for E91. The foam inserts are there in the trim. The whole thing costs 4830 Swedish crowns (approx. 480 Euros with VAT and all). It certainly is not cheap! The so called alpine 4 inch speakers are slightly bigger than my 4 inch Hertz speakers. I was thinking of putting the Hertz ECX 100 in the back doors. Looks like I will have to make an adapter with three holes first to mount the Hertz. Any ideas how to go about making a simple adapter?
Matt, I don't want to stress you up but some of us are waiting for your pictures and possibly a write up!