I have AR catless on my IS and I am not a big fan as it is too raspy for me. I am hoping to get resonators installed soon. It is so loud right now when I start up in the morning.
BTW, I had AR in my previous 335i with stock exhaust and I loved it
Current: 2003 E46 M3, 2004 E46 M3, 2015 F30 335i, 2015 F80 M3