I am looking for 100% SS header for 99 GSR. I won't somthing that will be a direct bolt on with 02 plugs and so forth. Does anyone know how many sensors a 99 header has. I seem to recall that my car had a 02 sensor on the cat and not the header but it' cold outside so I figured someone here might be able to save me to time of jacking up my car for a look. Any recommendations for a SS (including flanges which eliminates Comptech and DC Sports) 4-2-1 header. The great header comparison only compared 4-1 models so it was not much help. Thanks.

 

OBD2 cars have an O2 at the cat and one at the header. 5Zigen, Greddy, and A'pex-i all have all-stainless 2" collector headers (and all have similar sized primary and secondary piping). I can get all 3. Lemme know if you're interested. HTH.