Got my T4 off the car at the moment as it's always been very laggy (Compared to other T4's)

Can't find any markings which I would normally have expected to find (T04E I believe was the normal marking on an RS500 Turbo).

The only Markings I can find are " M10 A/R .70 GARRETT 367-2" In that order around the front of the turbo casting.

Any ideas......