I have an 04 Impreza 2.5RS. Can anyone tell me if there is o2 sensors in the stock headers? My understanding is that there is not until the 06 versions. The new header that I am looking at does not have sensor mounts in it.

Thanks

Dwayne

 

I have an 05 and there are no o2 sensor bungs on the stock header. I replaced it with some borlas. It was a ***** to separate the cat from the header (stupid boldt and heat shield conflict).