I've heard of Pierce, but no, this was a tiny shop in LA called "AEM," something like Advanced Engine Machine or something. They almost exclusively worked on VW-race setups, but the guy was a pro with the 48IDAs. Only problem was, his Dyno at the time wasn't big enough for my car, I kept pegging it out when it was tuned right.
All I have of proof they exist is a chicken scratch of a phone number for them from 8 years ago...