Hey guys, I know this is nothing new,I am getting the P0420 code and am wondering do I just get new headers or try and replace the cat?I have looked on ebay and the internet and the options are pretty limited.OBX is really the only one I saw.Has anyone used these headers??Or are there others I am missing.Any advice would be awesome.TY

 

L31 Altima headers will fit your chassis no problem.


It's been done quite a bit in the past.

 

Yea that is what I have read.With that will the O2 sensors have to be cut and lengthened?Just trying to figure out how hard this is going to be to do.So I don't get into and have a massive surprise.Thanks for the reply.