My buddy needs a cat converter, he found an R converter but the guy thats selling it says its JDM. Is there such a thing? if so whats the difference between USDM and JDM. Is the GSR cat the same?????If not whats the difference??????thanks.

 

JDM Cat is a lot smaller in length than UKDM or USDM.
Also I think they are 2.5 in diameter and not 2.25 too.

I dont know about the GSR.