Took about 4 hours (included cleaning up the transom a lot once I removed the swim deck.) It also involved fabricating those support brackets under the swim deck from the provided square stock that Larry sent me. It wasn't all that hard and made a pretty big difference in the sound behind the boat. I did have an issue with the screws that were holding on my supratrapps -- they didn't seem to bite into enough material to get a good seal on the new flanges. I went out surfing last night and came back and was missing 2 screws... My auto-bilge was running a LOT. Will get some longer/larger screws and redo it tonight.