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Originally Posted by BP2K2Max
why would you have to weld in an 02 sensor? those are on the down-pipe.
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There is one in the rear pipe as well, it monitors what the fron two are doing. This is the one that often freezes up and has to be replaced when you get a new catback system.
Tell me something, if possible to describe, tell me how loud is this system? Can it be heard at idle or just when you punch it or can you hear it when you just drive normal? I know the question is a little nebulus, but I don't want something loud and obnoxious, I would accept throaty but not loud and racy. Just want something tasteful and that won't kill my mileage.
Also is this system a thicker guage metal than the stock system? To be honest the stock system from Nissan is as much as this so I may buy one of these instead.