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The 226 is the Rear Wheel Horsepower (RWHP) This is a driveline loss of 20% based on the 280 HP figure Infiniti gives. Acceptable loss ranges from 15-20%, so they are on the upper end, but it's still considered "normal."
I looked at the stock air box, and it's quite good IMO. It takes air from the cooler outside air, and seems to have a big element. I have a hard time believing that Injen can get 14 HP out of just a CAI. It's possible, but it seems a bit much. Most likely gains wouldn't be felt unless you were at WOT anyway. But who knows. If it's true, that's great bang for your buck.
CAI's don't void factory warrantee. I think it has something to do with non-moving parts. Not to mention, they are almost always bolt-on, so if you had problems, you could simply replace the old one, and the dealer wouldn't know the difference.
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