Who makes EPROM/Performance chips for these cars? Any owner opinions? Any hard facts to back it up?

Thanks in advance, folks

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo

Michael,
Have you tried Upsolute as they do most late models and their H/Q are here in Clt, NC?
Good luck,
Tobias MB
190/5.6