Had the car out for a spirited drive this afternoon on some back roads, while shifting from 1st to 2nd @ 5500rpm I had what sounded like a big dump of air. I pulled over, popped the hood everything looked fine.
Car starts, idles, drives fine, no weird noises but doesn't seem to build any boost.

I checked the bypass valve, holds vacuum and moves freely.
Also scanned for any codes- none
Vacuum lines seem to be all attached.

Any other ideas?