I'm wondering about what would cause high boost psi on my 6.7 I normaly only get about 27-30 psi. and some smoke when I want it to. Yesterday it was setting off the alarm on my edge. which is set at max 40 psi.( i'm sure it would have got higher it it hadn't started derating) smoke was gone, and was building boost like never before. What would cause this? I did nothing different to the truck, so was wondering what might have caused the sudden change.