Thanks for the info averep. Like I said these cats are new to me too. My last two boats were both 5.7 without cats and were good for five years with out any issues. All inboard recreational inboards manufactured after 2009 will have the cats. Its the law. The problem is that they are built into the exhaust system and located between the manifolds and the elbows. They save sensors on both sides of them which go through the ecm. With the electronics involved in these newer e.f.i. engines ,if I were to eliminate them some how, i,m quite sure there would be problems. Maby someone out there knows of this is true. By the way. I looked them up and the cost of two manifolds, two elbows and two cats is around $6,000.00 plus tax and installation. These manifolds are big as to be able to cool off the cats. Even if you have a f.w.c. engine with cats the manifolds are raw water cooled as they need the volume to cool them off. To make a long story short, if you are considering buying a late model twin gas engine boat, figure on spending around 16-18k every five years on manifolds and risers. Until they figure out a way to put cats on outboards, I guess we will be seeing more of them.
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