Be prepared for a hell of a ride...you will go DEEP. The caapi has an amazing synergy with mushrooms...but be prepared for some realms of deep weirdness, and the peak will be incredibly intense. However at the same time, the caapi is a guide, and changes the nature of the trip a lot...hard to explain in words really.
The experience will be much longer, more in the 8 hour region...the 'falling awake' part of the trip as you drift back into sobriety can be a bit strange, one can be left in a bit of a void...
Purging may feature, don't fight it. With mushrooms, I find fresh is best.
If you REALLY want to go the outer realms, caapi/shrooms/DMT is like the god of all psychedelic experiences...but can be a wee bit intense...:twisted: