Originally Posted by tranceformer

I did the same with my 350z when I added a set of Fast Intentions testpipes. It worked just fine. It was a cheap and easy fix.

But for some reason when we installed a set of Helix v2 testpipes on my friend's 350z it didn't seem to work that well. The helix testpipes he had came with the built-in extensions for the o2 sensors, they kept throwing a code for some reason.

I never did like those kind of test pipes, I prefer the ones without the o2 sensor extensions.