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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Dont waste your money on E3 plugs. You will never see the gains make up for the price. Your truck will run just as good or even better on a set of Champion Copper or NGK V-Power plugs.
If you change your cat, you should change your O2 sensors. Just doing one not the other is like taking a shower and washing your armpits, but not your crotch.