No boost ?
On the more complex side it could be broken turbo sharft, or foren object has hit turbo blades and killed the commpressor fins, and Leeks in hoseing you will here hi pitch hissing there, timing is another or cam jumped a tooth, hole in piston, could be a number of things, blocked air filter, just do the simple cheep or free eazy things 1st, to elimanate each posabillaty.
And how much boost are you getting , is it constant or up and down ?
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 Gigler
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