[KiaTech]

What exactly is it you'd like to have changed in the program? Open the intake, open the exhaust, you'll make more power. More than any ECU flash will give you, as if you add more fuel to make more power, you have to have more air otherwise you'll run rich, foul your cats, cost yourself money, and make a mess of everything.

It's a free world and you're welcome to waste your money on all kinds of things, but dumping more fuel into your engine isn't going to help unless you take the proper steps - and then the regular Kia ECU will adjust to some extent, and do just fine.

 

[KiaTech]

Air fuel ratios are simple: 14.7:1 is perfect - maximum power generated for each unit of air vs. fuel. Anything else, either rich or lean, will make less power. Rich will cost a fortune as your fuel economy falls, and lean tends to generate too much heat and you'll start wrecking things.

Turbos need engine management because the amount of air they generate requires more fuel than the stock computer is programmed to provide through stock injectors but they'll ideally aim for the exact same 14.7:1 ratio - with maybe a slight nudge to the rich side of the ratio for safety reasons.

The point of my post is this: you can gain more horsepower in other ways than a program or reflash will ever do with stock components. So start there, and by the time you actually need a change in engine control, something may be available.