I searched through some random threads and the itr header thread, but still have one question I'm hoping someone can answer. I have a complete '04 type S exhaust and 1 12" O2 extension.I was planning on using the ext. for my secondary O2, so my question is will I need another ext. for my primary or can I make the stock primary sensor length work?

 

So do you have a Type S and are looking to put the ITR header on? You're not being very specific as to what you're asking?

I have the ITR header on my car and I had to use an extension to reach the second O2 sensor and did not have to use an extension for the first O2 sensor.

 

Doh! to clear things up Im a 2005 Si running a 2004 type s exhaust.