4-1 or 4-2-1?

[projectsilvia97]

could someone please tell me the difference between a 4-1 header or a 4-2-1 header? which one is better? this header would be planning on going on a 92 hatchback with an APEXI WS cat back system. thanks in advance.

phil

[megotgsr]

4-1 header make more power at higher rpm's i wouldnt reccomend then if you have to shift before 7000rpm you also lose little torque at lower rpm's

[Ace$nyper]

what the fuck is wrong with you and your HUGE ass mis colored font?

[projectsilvia97]

even though his font is FUCKING HUGE, is he telling the truth?

[Ace$nyper]

pretty much where he pulled out 7k or higher its only usefull i would love to know.
4-1 is used on some cars factory Namely the ITR heck alot of guys with B motors swap on the ITR header for few ponies. most dnyo tests show there just as if not better then name brand
4-2-1 mid range and some upper
4-1 higher end power
thats just in genreal. on your D motor i would say go with a 4-2-1 a higher faster revving motor like b16a would see better use for 4-1s

[projectsilvia97]

thanks for the advice man

[killah_xft]

go 4-2-1... I am, and it's noice..

[Ace$nyper]

not a prob i'm still waiting to hear what was up with that first post really man that is some repugnet shit.

[projectsilvia97]

Originally Posted by Ace$nyper

not a prob i'm still waiting to hear what was up with that first post really man that is some repugnet shit.

you talking about that whack job who calls himself megotgsr? he's weird and shit.

[Ace$nyper]

i guess doing PCP then typing can make you kinda post crazy things.

[Plastic_Fork]

I had chosen a 4-2-1 design for mine simply because the B16 lacks a lot of torque, so I was improving exhaust flow and some top-end improvement with minimal loss in mid-range torque.

The 4-1 design yields better top-end gains, but you will sacrifice some mid-range torque.

If I do an engine build-up in the future, I may opt for the 4-1 design since I will have improved torque to offset the mid-range loss with the 4-1 design.

[tsugsr]

hmm, im trying to make up my mind about this too, i have a 95 GSR, i want more around town torque so i think im gonna go with 4-2-1...any advice??

[Plastic_Fork]

I would suggest the same thing I was going to buy for mine - a 4-2-1 one-piece header from DC Sports.

[whtteg]

I think for the GSR you will be fine with a 4-1 it should still retain some good driving around town tq due to the dual runner intake manifold, and the extra displacement over the b16. I just feel that the 4-2-1 will not flow well in the higher rpm, compared to the 4-1, and the higher rpm is were the powerband is on a GSR. But that is just my

[jcrx]

There is more to header design then where and when the runners meet and merge. The length and diameter of the piping and collector also greatly effects performance. Nowadays, both 4-2-1's and 4-1's depending on design can yield exactly the same results, or vise versa of the standard thought. Which is 4-2-1 for more torque and 4-1 for more top end. Quite honestly the only way to tell is to compare dyno charts, but the best performing are AN-R, SMSP, and the JDM ITR 4-1.