In the past I have gutted every pump that came into my possession. I just found this real clean G@B 914 twin which I posted in the showcase section and many people say to leave it original and not gut it including some close friends. It is SO heavy. I gut them for that fact and that they will never be used as a real pump again. I have never heard someone say I will pass on that pump because the guts were gone. It also comes down to safety, who wants that thing to tip onto you or wrench your back when moving it around. Anyway I was going to get started on that today, sat down and had second thoughts. The inside looks like new. I am sure it just comes down to personal choice, I don't see how it would increase/decrease the value later on. What do you think? Thanks, Todd.