A tune is an absolute must for a diesel you will love it. I also put 20" OEM 214 wheels on mine along with the OEM sport fender flares. It improves the look a lot.
Before
After
I added 20mm rear spacers after the pictures were taken
.
__________________
X5M, Eisenmann exhaust, 22" HRE wheels, catless down pipes, Stage II tune/X5 Diesel, Lowered & Tuned