So in short i bought a 2010 535i xdrive for 2k with a sieze motor. Sourced a motor with 88k and rear end damage. I didnt have a lift so i had a shop install it and also do ever gasket. The motor came with a good front seal and whether they forgot or just didnt do it while the new engibe was out, they never took off the harmonic balancer to install the guard. How hard is this to do.. now i have 2 N54's and the old one is getting built for my 100k 04 530i. With a single turbo. Now how hard it this to do? Can i do it from underneath or do i have to pull the bumber, the radiator etc. To get to the belt and balancer?

Tyia