Megadeth's 2004 'Youthanasia' reissue is like this. They quite literally just went in and slid everything up to max. Fucking unlistenable.
I also love when the remaster consists of swapping the panning and nothing else. "Now the lead guitar is 22% to the left instead of 22% to the right, that'll be £15 please".
Not metal but Michael Jackson's "Bad". The original CD master sounds much more relaxed and dynamic compared to the current master used on Spotify, Qobuz etc.