Damn man! You did the thing that I am thinking about for a while, I want to put M4 seats in my E36 too, just like you put new MK6 seats in yours, don't forget to send pics when it is all installed and shit, might push me to get modern seats too.
Ah, I hope Merc is alright too, even tho I am not experienced with V8's I am sure that Merc guys will diagnose all problems without problems. L3G4L is looks clean too, it came a long way since we put it in a container haha.
