I have a 94 gsr and i am buying a header from a 98. My question is, are the O2 sencors in the same place? And will the header work? If i buy a test pipe will there be an O2 fiting in that or will it be in the new header?

 

Are you planning to use no cat on a street vehicle? Not to be a hippy anything but, IMHO you can get a high flow cat, make the same power and not drive around clubbing baby seals.