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do I need o2 sims?

710 views 3 replies 2 participants last post by  99RT10&GTS 
#1 ·
running a full ehaust with only up streams and a vec3 with Roe tune

will i get more if I install downstream 02 sims or does the vec3 take care of all that?

thanks
 
#2 ·
Gen II car, correct? What year? You should have to plug in the rears regardless(o2 simms or the stock rear). if 1996-98, it should not throw a code, 99 maybe will, maybe won't. 2000 and later, they will throw codes.
 
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