Least you know what the problem is! What hybrid is it? Whip the turbine housing off and have a look at the exhaust side blades see if there's any damage to the blades that could be causing the power loss and whine.
My best friend Mark has a 1.8 6speed SVT MK2.5 model and to be honest it's fucking awesome. Handles amazingly and is plenty kick with a few choice mods!