Hi guys, new member here. I bought a 2000 Stingray LX at the end of last summer and I'm getting familiar with this boat. I've never owned a boat with an I/O before. It's got a merc 4.3L vortec with the one piece exhaust manifolds. Whats the proper position of the exhaust flappers at rest? I took my exhaust manifolds off for inspection and see that the flappers look to be in good shape but are not closed, is this normal? Is it just the back flow of water that will push them closed, or does the fact that they are open now indicate that they should be replaced? Thanks' for all input.