I Do You will have to get a Custom tune. I would go to diablosports websiteand make sure they have a Dealer nearby with a dyno. It will cost you an additional $120.00 for the custom tune.
Get the Predator from Runnin' With The Devil. You'll get the Predator and unlimited custom tuning. It will come out cheaper than buying the Predator from one vendor then paying for a custom tune later.
As far as tuning for a blower with the Predator.... *shrug* I don't know what's involved with tuning for a blower. If it's just timing and a/f ratio, then you can tune with the Predator. What you won't have is an accurate reading of your a/f ratio. You can get this on a dyno or you can buy and install your own wideband a/f meter for about $300-500.