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Hands down, AEM EMS....second to that, DSMLink.
It all honestly depends on what your future goals are with the car. Do you plan to make more power than stock? And how much more? i.e Bigger turbo? If so, than bigger injectors, pump etc...
Still gonna use stock MAF? Or maybe blow-thru? Maybe neither?
Engine rebuild perhaps? That yeilds changes to compression. How about cams? Big frontmount. Sheet metal intake manifold? Pump gas or race gas? Etc...etc...
Bottom line is this: the money your gonna spend on this chip (depending what stage you need, and the fact that you MUST have a socketed ECU) PLUS the money for an AFC (### lets face it, once you turn up the boost and add fuel, there's no chip out there that can accurately compensate for changes in air/fuel. OR make changes to timing when your powerband changes)
Everytime you make a minor change in your setup (say for example, you now have a better intercooler, so you turn up the boost couple psi), you have to have a new chip "reburned" for you....
If you do the math, in the end you've spent (and will continue spending) more than what DSMLink costs for example.
I didnt check your profile to see what mods you have, but honestly, the safest route to go right now is try to make as much power as you can with bolt ons....even ending with a bigger turbo.
When you've realized those mods, and its time for bigger injectors, THEN, think about ECU control i.e whether its standalone, DSMLink, SuperAFC....
If you serious power goals you'd like to reach, the keydivers is gonna be a waste of time and money...
...like the old adage says: 'do it once, do it right'
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