is there anyone using 4-1 header for S2000?any brand....

 

Yes, I have Comptech 4-1 header. Made a TQ increase alot in the mid power band and a little on top and bottem.

 

Hate to play devils advocate, but do you have a dyno to show this?

a 4 - 1 header will mostly do its magic in the higher RPM's, not low or even mid range. Your analysis is exactly opposite to what it should be. Originally, Spoons first header for the S2000 was a 4 -1 design, but because a lot of people complained about no torque in the midrange, they made a new design which is a 4-2-1.

I guess it just depends on what you are looking for and at what RPM you want the gain.

 

http://www.comptechusa.com/images/dyno/s2k...-comparison.pdf

FYI, S2000RAT has a SC, results might be different under boost.

 

I have no dyno reports, but love my SS DC Sports Header 4-2-1.