Considering that most end cans don't do much for power anyway, i don't see any difference between putting one on a restricted bike or an unrestricted bike... They're mainly for looks and sound anyway. Putting a full system on would be fairly pointless though
Are you planning to get a can with a removable, road legal baffle? I had a chambered road legal can which sounded nice, but didn't have the hooligan option of removing the baffle- I was pleased with it but these days I reckon a baffled can is a much more sensible option.