Has anyone heard of these guys? They are based out of California in the US. This is what they sent me in an email after I enquired about their tune:
"We have had the tune for over 2 years now and have approximately about 30 cars running our software. Most are in England, US and a few in Canada."
Here is some info from their site on the 335d tune:
http://www.superlativeautosport.com/...-software.html