I was referred to Edge by cowerkers. I brought in my car for a variety of maintenance/upgrades (belts and pulleys, power steering pump , AC compressor, starter motor, cooling system overhaul, intercooler, charge pipe, vaccum line change, high pressure fuel pump, low pressure fuel pump and more). All I can say is that the folks at Edge are true enthusiasts who are also professionals. Most importantly, they are very honest. They inspected my car, gave me advice on what should be changed and what should be deferred for the time being. Some of the parts I provided weren't plug 'n 'play so to say and they went into lengths to ensure proper installation. I highly recommend this shop for any BMW enthusiast who cares about their car and is careful about letting random indy shops work on it.