yer that happens when u run more air flow through ur engine turbo boost' more with the increased air flow, i ran my old car like that for over a year and no probs on 12 psi, but i had bigger injectors and fuel pump.. its not the heat that kills it. it is lack of fuel, hot air going in without enough fuel causes bad ignition which generates alot of heat, and thats what will **** up ur engine, if u put in a bigger fuel pump and injectors, even if they aint huge. lets say u have an rb20 u can go like a 040 bosch pump and rb25 injectors, or if u have a rb25 u can go rb26 injectors with an 040 or 044 its very cheap and a must do to keep ur engine safe imho, mind u im not an expert, this is just in my experience with skylines over the last 2 year feel free to correct me on anything if u know better!