I recently installed the z1 y pipe on my car after finding the oem one had holes in the flex pipe. The car began making a metallic rattle sound at about 800 rpms and when accelerating slowly like down residential streets where the sound is amplified. I changed out all the gaskets, adjusted the clamps, used red loctite on the o2 port with the provided bolt and took the whole y pipe fully off the car to adjust it but have not been able to get the sound to go away. Anyone with the z1 y pipe having these issues or how you solved it? Thanks