I ordered a slightly used 4:2:1 Airmass header off someone on thepartstrader.com. I told him that I had a LS motor and asked what the header was for, he said it fits all 94+ Integras. Well, it turns out it must be designed for a GSR because it is about 6" too short. My question is, can I have a pipe w/ the o2 sensor hole made to fit the gap? My idea was actually to remove my cat and have a straight pipe fitted but will the header fit and preform correctly?