You are correct, the K11 HKS kit didn't come with an intercooler but it did come with a Mini F-Con fuel controller. So if you want the engine to last make sure you use an additional fuel controller to sortthe fueling. Just because one car can get away with it without one doesn't mean all cars can. From seeing countless people blow K11 engines by trying to cut corners, this is an absolute necessity.
As Ed said, a piggyback on a K11 will never work properly. We spent a lot of time tuning my NA car, which some would argue fuelling is less critical on, and it never ran right. There are a few quirks which are not ideal, especially for a turbo setup. Piggybacks are always a compromise in our situation no matter what you are told by others.
