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A new O2 sensor wouldn't hurt, but in most cases it should throw a code (is code21 an O2 sensor). I think there is some way to check the conductivity of the sensor but I'm sure someone with more experience will chime in.
Put a high flow cat on and get a new O2 sensor and you should be set. If it still sucks bottom end wise, consider going to smaller pipes, OR going with some headers as they may help with scavenging/movement of exhaust a bit.
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1993 Xtra Cab Pickup | 4x4 | 3.0 - V6 | R150F | Silver-Grey | Amsoil 10w30 synthetic oil | Amsoil Synthetic Drivetrain fluids|
Borla Cat-back Exhaust | OME HD Leaf Springs | Bilstein HD Shocks | Downey Idler Arm Brace | Grey Husky Liners | SR5 Bucket Seat Swap | Color matched Canopy | Yakima racks | Line-X OTR | Michelin LTX A/T 31 x 10.5 x 15 | 323,600 KM's (202,250 miles) | Made in Japan - Vin starts with "J"| Fish on
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