You've now owned 2 turbo Souls, consider yourself very rare. Not sure what the numbers are but the turbo accounts for a very, very tiny percentage of Soul sales so it probably made no sense for them to continue it. The new 1.6 in the K5, Sportages etc.. is a far more expensive and sophisticated engine so they probably thought it would bump up the Soul's price to a level that would make the turbo sales even worse and the old 1.6 in your car just probably doesn't cut it for new emissions and it would be the only Kia car to continue with the old Gamma engine (although the Niro uses a version of it now that I think about it)