When I got my car, there was a whole bunch of electrical tape around the collar nut. Today, I was taking off the top and taking out the intercooler, and I decided to tighten up the collar since they had obviously loosened it. What do I find under the tape? A cracked collar nut! How much boost do you think I was losing out of this bad boy? The top is completely rotatable around the nut... Does anyone have a stock upper IC tube with raised top firmly attached for a nice price?