Get the dp's and put them on. It will be easier because you have a lift and mechanics to aide you. I was in your same position about putting them on and i went for it and glad i did. you definitely can hear the waste gates more pronounced but it is worth the power. And if you need new turbos you onky have tontake them off and on one more time, not mutiple times.
07 335i. Montego Blue/Saddle Brown. 6 MT.