whats up everybody, i am just wondering, whats the difference between a header on a b18a1 and a header on a b18b1, i am just wondering because i have a b18a1 and a buddy of mine is getting rid of his header, and i wantto but it but idont know if it will bolt on or not, he wont let me try it before i buy it type of thing, but any help would be greatly appreciated, thanks in advance

if you and him are friends i would tell him to let you bolt it up or stick it up his ass

sorry to be replying to this so late

the header will fit both. but the oxygen sensor may be in a poor location.

as far as his aZZ i dont think you should try attatching it.you may end up with a poor performance and bad emmisions. :)