Ok, I put on a K&N FIPK kit last night (I have a bone stock 2004), the install was easier than I expected. I followed the advice I read on previous posts and drilled out the fitting for the hose connection on the RHS of the K&N inlet tube with a 7/32" drill bit as this hole was tapered a lot and was much smaller than the hole in the stock inlet tube. I measured the diameter of the hole in the stock inlet tube and it was 1/4", so I'm not off by much. Bolted everything on, started it up and it ran fine for about 2 minutes, with the expected extra intake noise. Then it started squealing VERY loudly, sounded like old belts squealing horribly, but was running ok. The sound was definetley coming from the air filter intake, put my ear up next to the inlet and it was loud. Shut it off to check if a filter had come loose or any other problems but I couldn't find anything. Started it up again and after 30 sec. or so and the squealing noise slowly abated until it sounded ok? I took it out for a ride and it ran fine, with the hood closed I can't hear any extra intake noise at all. Can't figure this one out, anyone have any input? Do I need to drill out the hole in the tube to a larger diameter? I remember a previous post where a guy put on the kit and lost 10 or 11 hp or so until he drilled out the tube, since I didn't baseline I'm wondering if everything is ok??