B18C4 header to 4-1

[mokus]

Hi! Im about to buy header, but I have to act fast.

Engine is stock B18C4, stock header. New header is 4-1 with bigger diameter tubes ofc.

My only question is that, the low and mid range are gonna lose torque or power with 4-1?

I know it gives on top end, but my exactly question is if the 4-1 has better diameters than stock, it could give the same powers on low and mid as stock? (and better on high end ofc)

I just dont want to loose on mid range

[mokus]

1 hour ago, UnicyclingTom said:

a 4-1 seems to only give gains at the top  end.

A 4-2-1 definitely gives greater toruqe (on my bum dyno)

I've had both on my aerodeck. 

The 4-1 sounds awesome,  but for daily driving I'd go for a 4-2-1

I know, but I want to know if the bigger diameter tubes of 4-1 allows to get the same power on low/mid as the stock.  If you know what i mean.

so if the stock 4-2-1 do 100 on X rpm, the 4-1 lose on low-mid BUT with bigger tubes maybe gives a little power for the lost low/mid, and reach the 100 like the stock one

 

[noodels]

Oem is very restrictive any good brand name manifold will be an upgrade 4-1, 4-2-1 or 4-2-2-1.

I have 4-2-1 Dc sport and had  good gains and is well made.

my aimed tune was for low,midrange&top with a twin loop also inlet & cams itr airbox ect.

So all depends what your future plan is for breathing mods ect

[mokus]

My plan is to keep the daily mid range power and gain on top, or later go for 4-2-1 aftermarket if I dont like the 4-1.

It would be a B series TSS 4-1 manifold. a bit bigger diameters. new price from germany is 400 euro. I will buy it for 90 euro. with TUV papers.

I just want to upgrade the exhaust system a bit, also have an ITR airbox with cold air feed. Maybe if its worth to do, i will adjust the ecu for these mods with tuned p28. But not sure yet,if it worth the money

 

[noodels]

Go for it at 90,will prob need an adjustable decat as the flange may not line up also.