I was hoping someone could tell me what years the ITR had a 4-2-1 style header. Also, what was the collector size for them. And even though these weren't tested here , can I still assume I would notice a performance gain with them? Is there just one O2 sensor and is it located at the bottom collector near the cat?

I have a g2 teg and I know a few other g2ers that have installed both the jdm itr 4-1 and the dc jdm itr 4-1 header and have gotten good gains with them. Problem is they've had to cut a notch in the crossmember and worry about ground clearance. That's why I'm hoping to pick up a jdm itr 4-2-1 and give it a shot.

Thanks in advance for any info.