Got a turbo in for rebuilding yesterday (not an N54) and found a perfect example of how much damage turbo over speed can cause if left unchecked for long periods of time. This is a on a dodge sprinter with an electronic box to control boost, they are known to go bad and most of these are work trucks, the driver just holds it to the floor and goes about his day. With the box failed, boost which equates to turbo speed is left unchecked, eventually the wheel basically just bursts like a balloon. Billet wheels virtually eliminate this problem but over speed can cause other issues and should be avoided as much as possible, stock frame upgrades when pushed hard are pretty much running in an over speed condition at all times under high load.
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