With all due respect Todd...an intelligent owner doesn't have anything to do with a boosted motor's propensity to pre-detonate. Even the very early E-23 745i turbo factory BMW M-30 engines with dished pistons and reduced compression replete with more primitive Motronic then later NA M-30's had a knock sensor...and for good reason.
If you spend $2K on a turbo set up...the least you can do is run a knock sensor to prevent melt down, low boost or not if you get less octane than you bargained for.
An occassional chipped NA M-30 is reported to detonate on high octane fuel. Not a remote stretch for a boosted turbo motor to do the same thing with much higher consequences.