First off I drive an 04.5 3500 with a 4 inch free flow exhaust and a k&n intake. I put on a power puck and it worked for a couple of days and then the truck started to barely be drivable with no boost and it sounded horrible-knocking. I took the puck off immediately and it drove normal and haven't put it back on. I put a gauge kit on and my egt's with no trailer will get up in the low 1300's going up hills or flooring it. With a trailer on I am looking at 1420 or so go up on ramps and hills. Anyone have any idea as to why my temp is high? I looked and it looks like my exhaust manifold has started to crack and my turbo has a small crack in it as well. Would this cause high EGT's?