I love it!
It seems that that are playing around with different exhausts based on several vids that have been posted. Just an obvious thing being tinkered with among the hundreds of things that aren't so apparent.
Keep them coming, very cool to see.
330i ~ BMW Perf. Susp. ~ M3 Front susp ~ BMW Perf Exhaust ~ 3.38 lsd ~ SF71 Alf CSL reps ~ Pilot Super Sports ~ AA Tune ~ 335is front brakes ~ over 150,000 miles hardly broken in! WTB: e93 M3 Front Sway Bar