There were other dealers doing various Ruf installations. The PO of my 79 turbo had his local shop install a Ruf 5-speed, Ruf front oil cooler and 17x9 and 17x10 Ruf Speedline wheels, along with a 3.5L conversion, Andial intercooler and fuel enrichment circuit, and other mods, all in 1989. This was done by PM Motorsports in Sacramento, which unfortunately burned down in 2014 (
https://www.theloudpedalblog.com/the-loud-pedal-news/pm-motorsports-fire)