I recognize this is a dated response, but I replaced the HX on hull 26 this spring 2016 after finding coolant in the bilge and tracing the leak back to the HX. Was able to replace it myself with the aid of these "great" forums. As noted in many of these forums, the M25XPB engine Idle / vibration is brutal on the HX ( need to ensure you're idling around 1,000 rpm.....anything lower and you get vibration issues ). Upon removal of the old HX found one of the old brackets had broken away from the HX and caused a small hole. Found a new HX on line for U$450 vs C$1,200 in Cda......was C$800 after fx, delivery and customs........delivered in 3 days.......took the old one in ( on the advise of these forums ) to a local radiator shop.....pressure tested and fixed for $80 the same day. Hassle of returning new one not worth the aggravation......now have a spare. Recommendation would be to remove your old hx and take it to a radiator shop for refurbishing if you are having issues......buy the new brackets to reinstall it, or get someone to fabricate new brackets for $25-$50. I likely saved $2,000 doing the installation myself after the frustration of paying an exorbitant $1,600 for a new sherwood water pump installation.....I know, I know it's not an Obeberdorfer......much harder to get many of these products in Canada! New HX works like a charm running at 160°F......will ďo an Oberdorfer if the Sherwood fails while I still own the boat. Much appreciate the great insight gleaned from these forums.....wouldn't have attempted the HX project without the information provided here.