I have had a few questions on this topic, so I will post my thoughts here as well. I don't think that CMI makes a bad product in general. From what I understand and from what I have read I honestly think that the problem comes from the parameters and requirements that Mercury gave them for these headers. I also think that the problem is with this specific header design and not with CMI in general because they do make some nice products. I have had CMI headers on other boats (as well as Stellings) and have never had a problem with them. The CMIs on my current boat have not given me any problems, but with all of the failures reported on the 525s I wanted to change them out just to be safe.