Hey guys, I'm new to the forum. My Ranger has been getting bad fuel mileage and is real sluggish, like I have a clogged catalytic converter. The reason I think it is the cat is because I have already tried, plugs, wires, fuel filter, etc. I called the Ford store and the cat for my truck is "obsolete". They suggested I try and aftermarket cat. Any suggestions on who I should try? Which cats fit the best?

havent tried myself but you might check out MAGNAFLOW

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98 B4000 5speed 4x4 mostly stock
air box mod.
throttle cable mod.