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realisticly, 8.3hp to the tires.
Hey, you asked for a number, hadnt seen one posted yet.
My Tahoe picked up 16 RWHP from the tune alone, more after adding the tube and a K&N drop in.
I think 25 hp is a little bit optimistic.
Again, it's about improving the driveability of the truck. You don't need to add mad amounts of hp/tq to maximize the potential that's already there. Besides, you can tune three identical trucks, put them on the dyno, and get three completely different results. Each engine is unique, and it's overall output depends on a ton of factors...how it was built, how it was broken in, how it's been maintained, it's current mileage, etc. I'd imagine this is why black bear doesn't advertise "XX horsepower increase guarenteed!".
Without putting your truck on a dyno before and after, all we are doing is guessing.