Know a guy who does pretty good test pipes, buts hes located out of state. Seeing as im away right now and cant look under my s2000, im pretty sure there is just a single cat correct? What length/width/how many (if any) o2 bungs are needed? Thanks alot.

 

Single cat , primary and secondary o2 sensors. Primary o2 is in the header section and secondary is at the end of the cat. if you are making a test pipe you should only need one bung.

 

T1R does make a test pipe for your S in full polished stainless. IM me for more details.