I have been running a 480 on top of my IHI now for about maybe 900 miles. Had been making around 55 lbs total boost then while truck pulling noticed the boost dip to 45. Felt like the IHI let go. So off it came and whatdoyaknow the wastegate valve was non-existent! So I pulled the 480 and this is what I found in the housing....ever so precariously perched. After tapping it a few times all the parts fell out thru the housing! Counting my lucky stars.....:woott: