i have a 97 jdm b18c.... and a 96-00 CTR exhaust system....not sure what year lol

question is will the itr header fit the ctr exhaust.... are the diameters the same

96 spec itr header diameter____?
98 spec itr header diameter is 2.5" i think
ctr header and exhaust diameter ____?

if anyone knows the diameters please fill in the blanks

 

I have the complete factory CTR exhaust on my 92 hatch (fit right up) and the diameter is around 2.25"...in fact, bolted straight up to B16A factory header. I would think the ITR header is larger than CTR, but I wouldn't expect much dif. Running ITR header on there would be nice, if one could be found cheap. But an aftermarket would be a better choice.

But yes, it will fit.

 

so the CTR exhaust is 2.25"..... so the last question is..... whats 96spec itr header diameter.... 2.25 or 2.5?..

 

just have a test pipe made that goes from 2.5 to 2.25 so you can run the ctr exhaust.

 

thats what i was thinking id have to do.... whats the power difference from going down diameters like that? anyone have any idea.... a 1/4 inch a big difference? little more back pressure?

 

if you were turbo like the red coupe at your work it would be...hahaha you should be fine going 2.5 to 2.25

 

haha we got jokes.... so any definite answer on the 96spec header diameter? 2.25 or 2.5?

 

JDM EK9 CTR and DC ITR exhaust manifold outlets and cat inlets should match up @ around 2-1/2". My 98 spec ITR exhaust manifold bolts up; I think the 96-97's have the same size outlet although they are different manifolds.