Just curious. Does the B16B come with a 2.5" header or not? Maybe like the '96 JDM ITR 4-2-1 (2 piece) header?

 

Oh, I found something: https://honda-tech.com/zerothread?id=1084898
Is it true?

 

well if they say 2.5 inch its really 2.38 at least thats what the stock header is. liek the ITR header, they claim its a 2.5 but its a 2.38 or 2.36

 

.....go with the toda unit.

 

jdm 96 spec b18c ITR header and b16b header are exactly the same

 

2.5 inch collector confirmed.

 

OK, thanks.

 

No its not really 2.5". The 96spec ITR and EK9 headers have double collector walls the OD of the outer pipe is 2.5" but the OD of the inner pipe (which is the one that counts) is 2.38". This is fact.

 

the 96 jdm itr and b16b header is the same. And yes, the collector is 2.38.. ive own the jdm96 itr heADER B4...bUT I'd pick the jdm dc 4-1 header w/ the 2.5 inch collector over the jdm itr 4-2-1 header any day.......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mugenracer &raquo;</TD></TR><TR><TD CLASS="quote">No its not really 2.5". The 96spec ITR and EK9 headers have double collector walls the OD of the outer pipe is 2.5" but the OD of the inner pipe (which is the one that counts) is 2.38". This is fact. </TD></TR></TABLE>
The OD of the outer pipe is what everyone is talking about, because that's also the size of the cat flange and donut gasket. The inner pipe can be easily removed.

 

Having taken another look at mine....i'd like to see it easily removed without cutting the collector