trying to decide on header. I want Jdm spec. Does DC make a 4-2-1 JDM spec header, or is it only 4-1. what is a good 4-2-1 JDM header or is there one?

 

DC does not make a JDM 4-2-1 header. The DC JDM ITR 4-1 is considered JDM style because it is a copy of the OEM Japanese market Integra Type R header. The OEM header for the JDM ITR is 4-1. I hope that makes sense.

If you want a JDM 4-2-1 header, I guess you would need to look for Japanese market companies that make equipment for the Integra/other B-series motor. You could look into companies such as Mugen, Spoon, and others that make 4-2-1 headers. A better bet in my opinion, if you want a 2.5 collector as the 4-1 JDM headers have, is to look at Hytech, AN-R, or other fabrications. I am pretty sure Bisimoto will make a header for the B18, though it will be expensive.

 

Right on, I hear Mugen's Gymkhana header is the best off-the-shelf 4-2-1 2.5" collector on the market. On par with SMSP and Hytech's. But they are crazy $$$, like $900+ I've heard Headertech makes more affordable custom headers, though. Never heard of Bisimoto.

 

The JDM 4-2-1 headers are usually stupid expensive and often oriented toward road racing. I have a Maxim Works header that retails at around $1600, and most of the other ones go for at least $900. If I were you, I'd look into one of the less expensive 4-1 headers like the JDM DC or the JDM ITR header.

 

vibrant has a new 4-2-1 2.5" collector i think. check it out

 

Bisi header $689 on http://www.exospeed.com, it's not JDM, but it makes power and looks like a snake.