It will still help having a better intercooler without the tune, in the same way that the PCM adapts for cooler weather and the car drives better. It is effectively the same as moving location to somewhere with lower ambient temperatures! But as Keith says, a tune will help maximise the benefit you get. Not unsafe in the meantime though, unless someone has previously tuned your car on the ragged edge of safety. Interesting question re intakes. Have been considering going turbo-side and have read a few comments about the car running lean and being unsafe if a turbo side is installed without a tune. I can't understand this as the MAP sensor is after the turbo and the car will still know exactly how much air is coming in. Sure the car MIGHT make boost a bit easier and hit the overboost limit but hard to see how it is that much of an issue?