There have been several threads on the Rennlist forum about trouble installing the 27HF turbo. When I installed mine I didn't experience the ones mentioned but I was puzzled by the bracket that helps support the turbo to the engine support. It has some built in tension so that when you take it off it seems like it won't go back on. It will but you will have to figure out the proper sequence of re-installing the bolts for your car to tighten a little at each bolt until it goes back flat. Some leave it off but I don't think Porsche would have gone to that much trouble for something that wasn't needed. I later put headers on and it would NOT fit so I cut it into two pieces and then welded it back together.