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My '93 NA 940 with Regina failed NOX miserably (~2700 ppm) and I think I need a cat. It's noisy and the heat shield seems to be intact. Been to many websites and I still don't know which one to buy. Mine has the O2 sensor in the cat. RockAuto lists two Walkers for my car, 15633 (27-1/4") and 15628 (29"). Which one? Is Walker OK or should I go with Bosal? FCP lists only one Bosal (099-942) for my car. Other sites list w/EGR, w/o EGR. I'm more confused the more I look around.
Thanks for your help.
Bob
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