Wrote in here the other day about a loud hissing/screaming noise coming from the engine bay. Turns out its not a boost leak at all it's the turbo on its way out

So my mate says I've got a choice of either getting the turbo reconditioned or buying a new one altogether.
The golf's a '04' AUM 150 so chances are its running on a K03's.
Is there a bigger direct fitment turbo for this engine code?
Ive heard about getting the internals of a K04 put inside a K03's (or i think i have

) what I'm thinking is, i might aswel spend the money now while its broken, rather than upgrading it again in the future?
Let me know what you lads thinks best? Or where i can buy/get a new turbo from?
Thanks Brett