Hi, I am going to upgrade header in my Honda CRX type ED9. What are the differencies between 4-2-1 and 4-1. Do u have some experiences? Which one would you recommend? Thanks a lot

 

4-1 headers you will lose some bottom end, but gain more high end power. 4-2-1 gives you more mid range - high range power(not as much high end as the 4-1), without losing too much bottom end power. Just depends where you like the power to be.

 

4-2-1 if you have a D series, no need to build top end when D series motors have no top end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSVTEC 91 Civic &raquo;</TD></TR><TR><TD CLASS="quote">4-2-1 if you have a D series, no need to build top end when D series motors have no top end. </TD></TR></TABLE>

could not have said it better. you want midrange on the street anyway.

*end of thread*

 

Thanks for your comments. It seems to me now that 4-2-1 will be the best choice...
anyway, does it mean that there will be different max speed or just the way you reach max speed will be different?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSVTEC 91 Civic &raquo;</TD></TR><TR><TD CLASS="quote">4-2-1 if you have a D series, no need to build top end when D series motors have no top end. </TD></TR></TABLE>

Thats it.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by louis_c &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for your comments. It seems to me now that 4-2-1 will be the best choice...
anyway, does it mean that there will be different max speed or just the way you reach max speed will be different?</TD></TR></TABLE>

Your max speed will not change at all.
Is it on a D or B series?

 

It's D series. D16A8 - 96kW

 

Here's another good one for this thread. What header would some one recommend for the Dohc Zc, considering it's more so a mid-top end motor cause it's a twin cam.

 

Ive heard alot of people say it's more faster, or torquey anyways in mid to top end, so i was thinkin maybe a 4-1 header would be better?.