I just bought a DC JDM 2.5 collector header for my ITR, but when I bought it to a shop to install it. The mechanics told me that the collector point, where the 4 pipe meet into one pipe point, is too small and it will creates too much back pressure, and thus losing top end power. I don't know if this is true, can anyone PLS~ inform me if this is true? I hope you guys can help me out. Thank You for any help in advance.

 

I have the same header, but this is the first time I have heard anything like they described to you. I don't think creating too much back pressure is an issue with this header, but maybe someone else has further insight on this matter.

 

Because I really don't know if that mechanic is just f***ing me around, or is it really true. I have done a search and some of you ppl htat have it seems to like it alot. Any comment from anyone else?

 

If that's too small then the USDM header is the most restrictive header because it is smaller than the JDM DC one.

 

^^^^^^^^^

 

Yes i just installed the DC JDM header with 2.5' collector. It is way bigger than the USDM collector size. Truly a noticeable difference. I felt a lot more top end power. Just my .02

Mike

 

so i guess is good? I know ppl said that it is more like a copy of the USDM mugen header.......

 

Yes i think it is a decent header for the money. Mugen would be my 2nd choice but since i dont have a $1,000 to spend on a header i decided to go with the DC!

Mike