Figured I'd post some pics of my rear seat delete too. I haven't formally weighed these parts yet, but the bigger seat-back is pretty darn heavy. Acceleration with so much deleted, (including the big rear muffler) has really made this car fun! I realize most of you wouldn't bother with deleting so much, but I do not have children, & I regularly fill my GLA to the top with gear. I love this little CUV.
I also wanted this out in cyberspace so that someone else can see what is possible if they are planning any deletes for themselves.
I should probably post a pic with the cover on, where my scooter is. it looks less extreme with everything in place besides the seat backs being gone LOL