I agree to go the rainbow route if you don't want to mess with anything. I can almost guarentee you that the M341i is going to be a challenge cause of the magnet size and depth. You will have to push down your vent duct or heat it up a little and push it down. On the passenger side speaker opening, there is some body frame that comes down at like a 45 degree angle right under the speaker opening that is fine with the stock speakers because their baskets slope in to a small magnet. The diamonds have a big basket and big magnet in comparison. But still if you can get them from a shop that will let you take them back if they don't fit, or let you take them to the parking and try them on the spot, then it's worth paying more for local prices for the service.