i just bought a set of long tube headers for my c1500 silverado and they have 4 different O2 sensor holes how do i plug the ones i dont need without welding them shut. cuz that will void the warranty. or are these needed for something else?

 

Yyou can get O2 filler plugs at oriellys

 

^ what he said.

 

Just take one of your rear O2s with you to get right thread pattern

 

What they^^^^^ said or just stick a bolt in it.