The diverter valve doesnt make much noise change, but holds boost nice between shifting, noticable in manuals, not so much in DSG but will make a difference, easyISH install as my turbo is at the front and the diverter valve bolts are a pain to get to so you may have to unbolt surrounding parts. I have not tuned it at all and all the sounds can be heard outside inside and cabin just easier(risky to) to but phone in the engine bay to show you noise when acctually being driven EG low speed, high speed and going up hills, personally i love the sound everything also just feels nicer!
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