what is the collector size of the 4-1 dc header (non jdm) ?

 

2 1/4, same size as the stock one...

 

hybrider-- i just put one in on my b17a. the only difference between a dc 4-1 and the jdm version is the non jdm has a carb exempt little tag on it, and the jdm has the 2.5 collector. they have the exact same primaries and flanges and whatever. HTH. --later

 

its 2 and a half

 

2.5? the JDM one is 2.5

 

yup, a stock USDM type R header will yeild better results hp wise

 

vegeta-- are you saying a stock usdm 4-2-1- ITR header will yeild more power than a DC 4-1 non jdm? i beg to differ, i just did the switch. maybe if you are running an LS, but for vtec no way! especially w/ the ITR intake mani. i think you a mistaken. do you have any time slips or any other data, i'd like to hear more on this topic. thanks

 

I had the non jdm 4-1 ceramic a while back, 2.25 collector. Felt like i gained a little up top nothing major. However it did manage to start rusting and it developed an exhaust leak by the collector after 6 months of use. Im much happier with my current header. You get what you pay for.

 

thanks ppl