i can get a sweet deal on a one piece 4-2-1 Lightspeed header..
the guy im buying it from has a 93 civic si. i have a 91 civic si.

will it fit?
thanks.

 

yes it will "fit"
i am not sure if u might encounter any ratling problems when it goes down and hides under the block... but as far as flanges and size.. they are

 

that header will bolt to your head and im pretty sure the ports will match up, however, you might have clearance problems with the B-pipe

 

It will fit your stock D16A6 motor, but it willn't fit the b16a like your signature says.

 

yeah i knew it would bold up, i just wanted to know if it could clear. because i went to their website and they never said anything about the EF, just saying the part numbers for the EG.
im getting it cheap enought im gunna throw it on my d series..
my b16a isn't finished yet. and im thinking of trading it to a friend for a b18c1..