I have the "43" engine in my Merc 4x4 and in Sport + last time I drove up Cheddar Gorge I swear I saw the rocks crumble. The +8 is on side pipes, there was no stuffing left in the boxes. I have a John Eales engine from the 90s. In Switzerland 5 years ago in the tunnels the guy behind me said it was flaming out of the pipes. And I did get banned from a track day a few years ago. 106db but as I promised to drive past the noise meter slowly I was allowed to continue. My hearing isn't what it was so I did have the boxes cut open and some "sound insulation" added and welded close. I do (or did) 6k miles a year in the car and had some ear plugs made by a company in London. They specialise in ones for musicians. They scan your ear canal and 3D print them. Fit perfectly and they weren't expensive.
