I have read somewhere that they only work with Imco stuff but I have seen them on bravo stuff. What mods are needed to make the -3"s work?

They bolt right up to the Bravo upper. You will be limited to a 14 7/8 diameter prop in this stock form. In order to run larger diameter props, the last 3 inches of the upper behind where the trim rams bolt to the drive will need to be ground or cut to accept the prop diameter. This is actually pretty simple to do. The only downside of this is if you ever go back to stock bravo lowers you will have a gap at the rear between the upper and lower where it cut.

brian are you changing yours?

I have a -3 with the Imco upper. The upper is redesigned just in front of where the tab bolt would go, it curves up some for clearance.

Cool I was just curious I found one on another site and they mentioned it would work on a bravo upper. I figured props would be limited for clearance, I have -2"s and doesnt seem to be much room for -3's. Thanks