Will this fit on GSR without modifying the exhaust piping? how big is the collector, cause it looks like 2.5", I guess that gonna be a problem. Will this make any improvement over stock GSR header? allright, any thoughts will be appreciated

 

Fitment should be the same as the honda 4-1 header.

 

96specr is cast upper and ss lower as i recall correctly? sgt?

 

correct.

 

It's 2.5" OD, the inside is only 2"

Sam

 

what??
we arent talking about US model.

 

Not sure I follow you sgT??? - I was referring to his question about the collector being 2.5"

 

flange is about 2.5" but even with the antireversion chamber the opening is
still larger than 2"

 

*runs out to garage, measures '96 Spec JDM header sitting in corner*

The ID of the opening is 53mm = 2.086614inches

Guess I should have said I measured the ID

Sam

 

should fit just find but you need to modified the piping !

 

Wow.
So the outerwall on the flange is 60mm?

 

Dunno if this will help but: