Is there any difference in a USDM JDM header, eg DC sports one, and a mugen spoon or other j-spec header, in collector lenght etc?? Can i buy a USDM header either 4-2-1 or 4-1 and bolt it straight up to my JDM cat/exhaust??

Also (and i did a search) which one sometimes causes clearance problems?

 

ttt........please someone is bound to know the answer

 

You should get your wording right.

The JDM header have a 2.25" collector if I am not mistaken. While the US is only a 2". So, no the USDM will not bolt up if you have a "JDM" cat. LoL. JDM.

 

if your going to quote someone it helps to put in the complete sentence not half of it!!! Anywho what i meant was, is there a difference between a US header manufactured to JDM specifications ( for example the DC Sports JDM 4-1) and a header actually manufactured in japan by spoon or mugen or who ever for JDM cars