E46 M3 Differential Gear Ratio Change?

[FurioAPB]

Hiya folks,


I'm wanting to get my diff gear ratio changed from the stock 3.62 to a 4.10 for track purposes. Has anyone on here had this done and can recommend a place that will do it? I'd like to avoid buying a completely new diff as they are hella expensive and I don't plan on swapping back.

(Located in Scotland but won't mind about shipping anywhere in the UK)

Any help would be great.

Cheers.