Well... it won't be easy but it's not impossible. I re-did my 318is a few years back but you'll have to remove the seats, the door sill moldings and the seat brackets, centre console... etc etc etc and then comes taking the old carpet out. Took me about a week but I had another vehicle to drive to work while I did it. Once the carpet is out you have to clean out any dirt, grime and glue before placing the new carpet down. While the carpet is out you may as well inspect the floor for rust. My passenger side floor had some rust (94). I sanded the rust out and used POR 15 primer and paint before laying down the new carpet. While your at it take a look at the seat rails for rust.
the carpet i hear can be a bit of a pain, but basically you need to take the front seats out , and the rear bottom half of the seat out, it should be pretty much straight forward, i cant forsee any real issues. but if you do change the carpet on your own , would you take some pictures and do a DIY writeup?
did it with dad and took about 10hrs all up, but that included doing new seatbelts and new trim stuff. ill do a diy and let u guys know about it. but yeah it was worth it, black is much nicer than gray imo.
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