any one that know what are all the header designs.
i know the JDM ones are 4-1 stainless

i the got the 4-2-1, two piece full stainless - this is suppose to be the AUSDM header

then ive got a set of headers that are 4-2-1 , half cast iron and half stainless

i bought the last headers from a guy that told me they are ITR headers.

did the ITR headers come out with the 4-2 bit in cast iron and the 2-1 in stainless? for some reason i think it maybe vtir headers