Don't own a DC but thought I might contribute.

I've heard many stories about SA Police (especially Northern Suburbs) and how "bad" they are, etc etc.

I owned a VN Commodore, loud exhaust, lowered on stockies, drove like a hoon and was never pulled over, luck of the draw I guess.

N14 SSS, pulled over once for dumping the clutch out of maccas in Gawler, happened to be behind an undercover in a VE, let off with a warning, very friendly.

My DA9 isn't even looked at, only been pulled over once in an RBT station, noticed my exhaust was slightly rusted, a female officer let me know and told me to get it replaced whenever is convenient for me.

I'm probably just lucky, but I've had no problems with cops in the 4 years I've been on the road.