Burger makes the JB4 which is probably the most popular and safest piggyback for the Genesis/Hyundai/Kia turbo platforms. All you need is a set of colder plugs and the piggyback for less than $700 on pump 93 you can get another 60+ HP easily. Add meth and/or E85 mix and you can turn it up even further.
Also, there are tuners (Lozic, LAP3, etc) that you can either buy a spare ECU/TCU with a tune or send your OE one to have flashed. I believe the fastest Stinger on stock turbos is in the mid/upper 11s in the quarter.
Also, there are tuners (Lozic, LAP3, etc) that you can either buy a spare ECU/TCU with a tune or send your OE one to have flashed. I believe the fastest Stinger on stock turbos is in the mid/upper 11s in the quarter.