hey guys, I'm going to have nismo headers and HR cats installed in a few days, I'm also installing a plenum spacer and mrev2 manifold as well, is there a need to replace the o2 sensors with a new pair of cats going in? Haven't thrown any codes or anything of the sort, my car has 98k and if it makes sense to replace them at that age I can. Should I hold off and use my old ones or buy new ones?

 

Unless they're not functioning correctly there's no reason to replace them. I would seriously look into a tune tho.

 

Thanks Seymore, I'm researching my tuning options.

 

Uprev, either dyno tuned locally or etuned with datalogs. Makes a big difference, especially with those mods.

 

Thanks man, yeah i'm trying to find a good tuner local to me. I don't think i'm going to go the etune route.

 

You get more bang for your buck with the etune route... I'll shoot you a PM

EDIT nevermind I see you have an 03.. definitely dyno tune