Big metal cup thing that goes around the guibo

[Turbo-Brown]

Does anyone know what the point of it is?

Seems like a tinsy little flywheel for the back of the gearbox or something?

Cheers!
Alex

[lentec]

I think its some kind of balancer? type thing for the prop?
I found it just made it more awkward to get to the bolts!
So i didnt fit it

[Ant]

it's a vibration damper, the outer ring is suspended from the inner on rubber mounts and does indeed serve as a damper in the same way as front crank sprockets do

neither of my 325s have had one fitted but I've seen a few that have, cant say I've ever noticed a difference between the have and have nots

Could be a case for a weeeeeee bit maybe folks

[A1BMW325iSport]

mine has it fitted, it was a bit tricky to replace the guibo, but bmw must have found it necessary to fit it in the first place...

[Jos]

Was wondering what you were talking about lol, I haven't seen one before, mind you only had my head under 3 BMWs so far so limited experience.

[Martinaston]

At a guess it would make the rear gearbox bearing last a bit longer