Hi
I want to hear some advice about 4-1 vs 4-2-1 DC Headers.

Thanks

 

I have the DC 4-2-1 one piece ceramic on my gsr. Some low end and midrange gains but nothing extreme. High end feels nice. I've had it for about 2 years so I really don't remember how it was without it.
JT

 

I wanted to keep the torque and midrange power so I went with the 421 setup. The 41 headers are known for high end power while sacrificing a little on the bottom and mid range. If you are a dragger only, then go the 4-1 setup.

 

also realize this .... something i just ran into this weekend ...

2 piece or 1 piece header design ....


i personally am for the 1 piece header design...

but this weekend ... I couldnt take my oil pan off without having to first take the whole entire header off of the head and detach it from the hiflow cat .... didnt have a new exhaust manifold gasket .... sooo needless to say ... oil pan didnt come off ...

i think id still get a 1 piece header design .... but a 2piece sure would have been so much easier (:

 

Basically it comes down to where you want to increase your power. As someone above said, 4-1 will net you more high end power, and 4-2-1 will net you more midrange. If you are up in high revs a lot, you'll want the 4-1, plus it mates better with the high end vtec if you have a vtec engine. However some people are in favor of having the 4-2-1 save their midrange and let vtec take care of the high end. It's a matter of preference. And as far as one and two piece go, aren't the one pieces also slightly lighter and supposed to flow better?

 

i heard the comptech 4-2-1 gives u both increases from the great header test..... http://www.automotiveperformanceengi...om/header.html

 

I've had both, and haven't noticed a difference between the two, so go figure...

 

i say ..


if your gonna just do I/H/E get the 4-2-1

but if your building a real beast .. get the 4-1 less restrictive airflow ... more free flowing

 

What about the JDM DC Sports 4-1 with 2.5" collector?

 

this is why I bought comptech --- great low end while being very competitive with the 4-1's in the top

 

If the funds are available, the Spoon 4-2-1 header is a great design that gives you both midrange and top end power. It is costly though, but the gains are all across the powerband.

 

that header test just tests BOLT ON results.
NO TUNING.