Sitting here and thinking about my water reversion problem. Little recap here I have a 502 w/ Edlebrock heads and a ZZ502 cam and Stainless marine exhausted. They had the shorter risers on them so I have extended the inner tube 12” . My tips mufflers that seem very restrictive. they look like this:

I have purchase a set of 4" tip to replace them and hoping this will help the low idle reversion problem I have been having. Any thoughts?

P.S those are not mine i just stole the pic from e-bay