Only way would be if ya done it yourself, but I wouldn't recommend it at all.
An reputable exhaust shop won't run it under the fuel tank for safety reasons, not only are most Ranger tanks plastic, but if you was to get a fuel filler hose leak or breather tube leak that could leak raw fuel onto the exhaust pipe, could/would be DISASTER!
I've eliminated that saddle tank for a fuel cell, but I did have a Bronco II tank mounted where the spare tire was, which would work for what your wantin to do, but you would have to extend you wires, lines, & whatnot.
My Bronco II tank is in EXCELLENT condition & is FOR SALE, and could be shipped as I've never had any gas in it since I've had it & it was reconditioned before I bought it. Shippin would be a lil' pricey due to the size.
$75 + shippin.