I brine enhanced birds all the time.
I don't think it does AS good on enhanced/injected birds, but I still do it.
1 g water
1 c salt
1/2 c sugar
whole peppercorns (about a palm full)
Rub (whatever you like)
This brine recipe is enough for a few chickens, so adjust accordingly.
Big JT's Smokin' BBQ Competition Team
"Oh, I donít reject Christ. I love Christ. Itís just that so many of you Christians are so unlike Christ."