A 2004 Explorer should have three converters. The two smaller, round cats grade Medium Domestic ($40-50 each), followed by a Regular Domestic main cat ($50-60). The front cats are only 3/4 full, but that's how they come from the factory. They are commonly bought as a pre, and while they are actually a pre-cat, the proper grade for them is Medium Domestic. Many newer Ford pres are actually pretty good material.
Early 2000s Explorers have two small pres ($25-30 each) and two Regular Domestics ($50-60 each). Some 97 to 2000 Explorers with the 4.0 and a 2-cat system have a pair of special High-Grade Domestics that can bring you well over $200 for the pair. Only the old ones from 94-back have the junky old setup with one Medium Domestic and one Low Grade Domestic.
Probably more than you ever wanted to know about Explorer cats, but I hope it's helpful to all of you guys who scrap vehicles. Explorers/Mountaineers are quite common, and many core buyers don't grade these converters correctly.
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