After the Revo, there's definitely more growl that could be heard, which kind of drowned out the sound of the turbo spool.
There was no performance boost with the intakes that I noticed, it's more sound aesthetics. There was a test someone ran on his TDI where he ran it vehicle with no filter at all for zero restriction and dyno was the same as with stock filter, which basically means you're not getting any performance gains out of an intake for a TDI.
As for after the tune, yeah, that made for really beastly sounds and performance.