Last trip out on my Vintage 99 SSLXI, (acme 515 prop) I did a WOT test and was surprised to discover that I could not get past 3900 rpms. I normally don't run her much past 3500 rpms so I don't know how long this condition has existed. The boat ran great, sounded fine, had normal power, it just maxed out at 39 mph 3900 rpms. I pulled the eight fuel injectors and placed each one in a zip lock bag with the cylinder number on each bag and mailed them to the Injector Experts at www.injectorexpert