As you are aware, parts availability has been an issue lately.  With that in mind, I decided to install a Challenger reusable oil filter on my 1995 Bravo.  Actually, an A&P who works at my shop did it for me.  I flew the airplane about an hour last weekend with no issues.  This morning, as I departed my home field climbing through about 600 ft AGL, my manifold pressure dropped from 36" to 32".  I immediately looked over my left shoulder and started a turn back to the field. When I looked bac