I have such situation in this week. I found that my boost coming just above 0.8 when normally it was max little above 0.7 so it was strange to me. Next day I found that my clutsch slip a little between 4500 to 6500 rpm. Today I drive to make some tests and found that my boost going even near 1 bar! Of course I have clutch spinning feeling too.
What it can be?
I have put Brian free flow exhaust last 500 miles as well as new turbo K7200 too. I take round 400 lbs of weight out too. Could it make such results? By the way I not found clutch smell and I surprise what is going on. Any idea?