So now my stock y-pipe is bad...heres the situation

[MTZI30]

So i bought this I30t from my work (niello Infiniti) about a month ago. Within 3 days of having it i got 2 check engine lights. They were coils on the 3 and 5 cylinder and service fixed it for free. Now a month later my car threw the good ole catylitic converter code. This is the 3rd code in a month i thought these cars were reliable? I am suppose to talk to the used car manager and service manager about how to handle this. However since the car is out of warranty the most they might do is help cover the cost. Isnt a cat like over a grand for these cars? Im thinking i might just ask what they are willing to do, but for 300 bucks for a whole performance pipe from warp speed, im thinking i might just do that and make them give me some free gas or something. I was thinknig of doing a new pipe anyway. And what is the b pipe and should i get one of those to? Any performacne gain or are they just for sound? Thanks..

[Beancooker]

I think the answer you're looking for is here: zerothread?id=230079