Gray market STREET bikes in the US are increasingly difficult. There may still be outfits that do this sort of thing, but I don't know who. The gray market bikes I've known of were either brought in by a foreign national or were brought in from Canada. Licensing is the hard part, you've got to find a way to get it by the EPA, or some sneaky way to avoid them. This would make a GSX1400 pretty expensive. Keep in mind the US market is one of the cheapest for Japanese bikes, so you'd have to buy a GSX14 in a higher priced market, ship it here, pay import duty and pay to deal with the EPA issue. Given the GSX14 doesn't offer much over a B12 (a little more torque), you'd have to like it a whole lot more than a B12. You could make a B12 out-torque it for less than it would cost you to get one in the USA.
Other countries, like Australia and the UK, have less stringent rules and have a large market of gray bikes & importers.
