There have been some bonkers AMG exhaust systems for the turbo engines if you do a quick search.
https://www.weistec.com/m157-downpipes-and-exhaust-g63.html M157 is the 5.5 V8 BiTurbo engine I had in the E63s estate and now the ML63PP. From the factory it will show 490-585bhp. With chip only tuning it will give you up to 720bhp. With exhaust and intake tweaks you can see 800 bhp but assume you will kill the gearbox and possibly snap a half shaft. An M157 with a sorted exhaust and engine map is a beast.
Looking forward to hearing your new system Peter. Tarka is going to be the most upgraded Aero about!
