Hey anyone got any idea what size this header is ? Jdm headers are all either 2" or 2.5" i thought?
Is this classed as 2.5" or is this a wierd size .... Its a strange long branch 4-2-1 mugen header off a SIR integra import.

Sorry for poor picture .


The red line ( inner bore ) is approx 2 and a quarter inch.
The yellow line ( part of the flange ) is probably 2.75"
The blue line ( is the outside of the tube ) approx 2.37 inch



Sorry for the rough measurements !

 

sorry dude ,they dont make any 2.37 exhaust pipe...I know you said its rough measurements....are you looking for a gasket or something? by your measurements, I would say go with a 2.5 ID gasket...or get a micrometer and really measure it....also you can just take the header with you and match it up to a gasket at the parts house

 

looks like 2 1/4 inch. should bolt up to stock exhaust

 

its not for my car, i bought it to sell it.
i didnt think they did any mugen smaller than 2.5" ?

 

2 1/4...