OP,
Excellent color combo. I am glad you enjoy your X6.
Truth be told, I put 2600miles on my X6 since early Nov and about 150 miles on my M3 during the same time.
If you feel the need to get a little more power, I suggest Dinan to keep warranty in place. I went with Dinantronic With added power, I always want to drive my X6 everywhere with 2 kids.
X6 is perfect combo for M3/M4.
In regard to sound system, I feel that X6 is louder since insulator is better. Then again, I rare listen to music in M3.
