Are JUN/Mugen headers that US members run on the cars the same spec as the same brand headers sold in japan, or do you have to modify the exhaust length to mate onto the header, and secondly will a JDM (actually from japan) header bolt straight onto a B18C engine without any problems, the reason i ask is i've found a HKS 4-2-1 header for my JDM Integra SiVTEC for $450 plus shipping, but its listed as a ITR 96-98 spec header, is there a difference in 98-00 ITR headers or was it just the pipe size that incresed.