IMO all off the shelf tunes do is give a good starting point for a tune later... or make the car drivable after installing a bunch of mods. no vendor has the ability to promise you wont have Kr. Down here in florida, i have seen PCM's from ZZP, Overkill, DHP, and Intense all have high levels of Kr. most just need downloaded and tweaked, but some are locked and the owner ends up needing to swap back to a stock pcm for tuning and sell the mod'd one. this is one benefit of finding someone local to tune your car. as long as they have experience tuning, they will know what works and what doesnt in your area. temp, pressure, humidity, altitude all effects your car. your local tuner can account for it and make your car run right and safe.