I bought some used Stillen test pipes from someone with a '05 G35 and they should be the same for '04 350Z from what I researched. Plus I know they fit before since they were used. I just installed DC headers (F*@kin longest install ever) with HKS true Duals only to find out my test pipes are about 3/4 inch to short. Does anyone know if I need spacers, extensions or something?

Please some input

Thanks in advance

 

350Z and G35 test pipes are interchangeable? I didn’t know that.

 

I called around and that's what most of them told me and the rest didn't know