Another owner agreed with me there is more noise when you drop the back seat and open up the trunk, more tire whine from the run flats. So here’s an easy $25 mod that will reduce the noise, Totally reversible, as the mat just lays on the floor and not attached in any way. Because you are not peeling off the paper backing, there is no smell of the butyl rubber. (But this mod requires you to buy a trunk mat of some sort.)
The product - look also for the 80 mil for a bit more money...
http://www.amazon.com/gp/product/B00...ilpage_o03_s00
I will be reporting back after a long drive this week....