Waste gate is not seperate on a KO4 it's attached to the turbo so you need a new turbo, however I understand Forge make some that could be fitted (with modifications).



EDIT - I assume the sound may be just at atmospheric dump valve not the wastegate ??
 
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Oh, I get the point.

BIG NO NO!!!!!

Thanks for the advice. I'm not the most michanically talented of people (not at all TBH)

May have other questions like this.
Just call me a muppet and it'll all be ok
:lol: