Not to alarm you or anything, because I could be wrong. But Ian had a sound similar to a drill when the turbo was spooling. It ended up being his turbine was scraping the side of the housing. In other words, it may be time for a new turbo or depending on how you look at it.

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PurplePlymouthGuy
1992 Laser AWD
DSMentia support group leader...
so many mods, I don't remember if its 20G or 20g's