If you remove and clean the turbo, make sure you are confident that you can put it back too. If you mess up cleaning it, it will break soon. As long as you mark everything, clean it well, and take notes when you remove it, you should be okay.
Are you sure that the EGR valve is not stuck open? This could cause low power and a strange noise.
Make sure you scan the car for codes before anything else, pulling the turbo is a big job.