Tuning with something like Hypertech is a waste of time. All it really does is increase the timing which the Genesis does automatically with premium gas. Something more customized may be more up the alley of the more savy car fanatics...like HP Tuners. I own it for my Camaro...many pros use it to tune these cars and it's likely unless a simple option like Hypertech came out with one, we're up a creek doing it ourselves which I don't recommend.
I'd be interested more in a turbo'd version of this car with
intercooler. It has decently low compression for a DOHC engine...enough to get 8psi thru an
intercooler without issue. Approximate gain would be conservatively 15 hp/ and 20 torque per PSI. There you have probably mid/upper 400s RWHP and similar for torque. Probably hold up pretty well against my SS.
I haven't seen an intake kit really minus the K&N air filter replacement which does little and as far as exhaust goes...not sure I want a "luxury" car with a loud exhaust. Best you'll get out of it is maybe a few HP and either an annoying tone or something you wish you didn't spend $750 on (Borla) for a more aggressive tune. If you could chop out the cats and resinators then tune it so it doesn't show for inspections...you'll get better flow and a stronger tone, my 2 cents.
Minus digging into the internals of the engine (heads/cams) which I doubt most would do thus voiding the warranty or force induction, I'm not seeing much to improve the already decent performance of this car.
The car is new but growing traction. Give it another year or so...some manufacturer will come out with performance upgrades that could make sense at a reasonable price. Great car and as a performance enthusiast, I'm looking forward to it. If I could get the Genesis up to 500rwhp like the Camaro, I'd sell the SS and the Genesis would be a nice sleeper with lots of
mods. I at this point dont see the internals/tranny, etc... holding up to that kind of power and since no one has tested it, at least not that i can see, no sense venturing down that path.