I haven't been on here in a long time, but I'm back! I just got a 07 c6 and it seems like it has the z51 package. It has 100k on it but maintenance has been kept up properly. The only question I have is should I worry about the harmonic balancer? I want to get it replaced regardless just for a piece of mind. I hear everyone gets the ATI instead of OEM. Does anyone know a reputable shop that can get the job done right? Should I be driving a certain way to prevent the HB from wearing out until the replacement?