4-1 header vs. 4-2-1 header

[240sxKA24DE]

I've been reseaching on whichone is better but not enough info was given.anyone have any comment that would help me ?

[neverlift]

a guy once told me that a 4~2~1 is good thru the entire powerband,and the 4~1 is more rpm specific,before you buy one ask them to email you dyno of stock car with the headers on.

[zanilth]

Yeah, from what I have read, 4-1 headers are usually most productive in the upper rpm ranges. Want a bigger powerband, stick with the 4-2-1.

[BIGT94z]

i have had both. 4-1 megan and now a 4-2-1 obx i will never run a 4-1 again plus the 4-2-1 helps me scare small children and old lady's

[Robi1]

4 into ones will give you better hp up to whatever rev range they're setup for. normally the shorter they are the higher the rpm's you will make a given amount of hp. the longer the lower the rev range or higher the altitude in which they make hp. depending on what your daily usage whether turbo/non turbo also of importance is diameter and flow of outlet pipe.

4/2/1s ok these are good for making torque .with moderate hp gainsthe ideal setup is in same sequence as firing order eg 1,3,4,2, 1 & 3 joined as first pair & 4 & 2 joined as second pair then a good diameter on the secondary pipes with approx twice the length of the primaries. this gives you a really strong low-mid range torque boost. those of us into pickups or vans favour this set up over tuned length 4-1s due to weight of vehicles etc. if you want all out hp with average torque gains go the 4-1 route if your looking for a streetable engine with good midrange then 4/2/1 is the go as you're running a 2.4l motor torque shouldn't be a problem as they're pretty tourqey anyway. depending on where you are ie sealevel or inland n up a few 1000ft will depend on the length/diameter of the primaries.2 1/4" outlet is good up to 2.8l. that helpful 4 u?

[Bigvinnie]

2.4litre KA's like a 4-2-1 header. KA's aren't high rev engines without lots of work done to the top and bottom ends of the engine.The DC sports is the #1 selling header in the market for it's 4-2-1 design, and ceramic coating.4-2-1 design header shows the best results dyno proven for the KA24de, and e's.HOTshot's,DCsports,and OBX, spuedo,

Greedy4-1 design header was discontinued, to many complaints, not enough power.....

[wankelTII]

As it was stated in Robi1's post (and others), the 4 to 1 will make power for a specific rpm. This doesnt mean that the engine has to spin really high or anything it just means that peak power will be at a specific rpm. In most cases the 4 to 1 will actually make more peak power than the 4-2-1 header will. The 4-2-1 usually makes for a wider powerband.

You could design an intake manifold and 4-1 header to make the most power at 3000rpms if you want, but it will cost you at higher rpms.