M400 Turbo Identification

[Fixanything]

Can anybody tell me what M2? and A/R.?? numbers are on the compressor casting on a M400 i.e. looking in from the OS rear wheel.

Cheers
fixanything

[Adrian W]

I can identify it, it's a big lumpy thing, one on the front of the engine and one on the back

[jamie g]

The a/r on the compressor side is 42 on an m400. A 4 can look like an M.

[Fixanything]

Jamie,

Many thanks