Originally Posted by dbarnes
Yep, if you don't want to drill holes then the only other easy method is to route the canisters thru the trunk side vents - that's how I mounted the Moton canisters in my e46 M3. I believe Richard mounted his old Moton CS canisters this way in his e92 M3.
If I don't get any other feedback, I'll post in this thread how I actually did it. I think I'm going to try to go right into that plastic pan in the floor of the trunk. It is held on by 10mm nuts from the top and then the aluminum heat shield holds it from under the car. I have it removed now and I think ultimately this might be the best way to do it. The nice thing about it is that it puts the canisters right under the carpet panel.