OK...what exactly are you asking? The greddy kit comes with a downpipe....TWO of them...each one bolts to the exhuast housing of the turbo.
I think you are refering to straight pipes. And to answer your question...you always have the risk of a CEL. They are just a pipe with nothing in them, so one brand will not be more likely to get a CEL that another. I went with Helix and the fitment was very good.
Well if youre wondering about a cat-back exhaust I have the Nismo one it sounds awesome even at the races people love the sound of my tt 350z. one guy who has a supercharged z with greddy exhaust I think it was and that was to loud IMO. Im happy with my choice of exhaust so good luck to ya!! Happy boosting!!
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