With that bit of info I would suggest you get a set of Autolite APP764's in there at the same time you go and buy new lower O2's (2 total - both downstream)

2000 SVT Turbo 295hp/269ftlb@12psi #1 for Bendix Brakes Kits! Knuckles rebuilt w/new bearings $55 AUSSIE ENDLINKS $70 Gutted pre-cats $80/set A lack of planning on your part does not constitute an emergency on mine!