if this is the boat in the for sale section, it has one piece manifolds, the risers are made into it. They are not available any more, it will have to be changed to a two piece manifold/riser set up, not a big deal, just different. As far as the temps of the manifolds, I've had brand new engines run one manifold hotter than the other at lower engine speeds, usually with alpha set ups. The water pump doesn't create enough volume to completly fill each manifold before exiting, the water allways takes the path of less resistance, so one maniofld gets more water than the other. On bravo ste ups, the belt driven pump can flow more water at idle speed to fill to restriction both manifolds and risers. If the manifolds are getting unevenly hotter at high rpms, then there is a restriction. Also consider the age, around here in salt water, if the engine hasn't been flushed, figure manifolds every three to four years, if its been flushed regulary, then figure 6 to 8. The one piece manifolds haven't been around for some while, if you could determine how old the engine iks, it would help. Unless the engine was a new old stock, or the boat has been pickled for a number of years, I'd go ahead and figure on new manifolds and risers. About $800-$900 in parts, plus labor
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