Bisimoto F22ax Header

[HondaFan81]

Being a 4-1 header, it will be designed more for race use than for street use... so a larger 2.5" collector makes sense.

He has 2 versions (street and race) for the F22, so I assume the same for the H22 will happen. I know the F22 street has a 2.5" collector.

[owequitit]

Being a 4-1 header, it will be designed more for race use than for street use... so a larger 2.5" collector makes sense.

I would think 2.5 minimum. Some mild bolt on H's have shown to benefit from 3".

[Dan89]

well since i've heard 2.25'' for an F22B jdm is supposedly the best. and I don't want to lose all my low and mid end power.

I don't want to fell the same has my F22A1 with no mods when I swap a F22B...

[owequitit]

well since i've heard 2.25'' for an F22B jdm is supposedly the best. and I don't want to lose all my low and mid end power.

I don't want to fell the same has my F22A1 with no mods when I swap a F22B...

Just because the collector is bigger does not mean you will lose low end.

The H22 makes 30 more HP than an F22B, and it would depend on your bolt ons which is best.

Bisi will make the correct size calculation for overall performance. I am confident in that.

The stock H22 collector is 2" for USDM, which is too small. That means that if everything is designed right, you could see more power from idle to redline with a 2.5".

There are many many variable besides collector size that will affect performance, so you will just have to trust Bisi's judgement.

[deevergote]

I would think 2.5 minimum. Some mild bolt on H's have shown to benefit from 3".

The key is to have the biggest exhaust you can possibly have while maintaining maximum flow velocity. If the exhaust system can be designed in a way to keep the velocity high with 3" starting with the collector, then that would be ideal. The way the engine itself is set up is a big factor as well, though. If the powerband is in the lower RPM range, a large collector will hurt performance. BUT... what NA Honda performance-built motor makes power down low anyway?

2.5" is a safe bet for most DOHC engines, and a mildly built SOHC F22 will probably benefit just the same (2.25" for a stock-ish F22 is the rule of thumb, but once you do some more work to it, larger will help.)


Still, whatever Bisi releases, you can be sure it'll make plenty of power! If you aren't sure what a part will do for you, feel free to ask. Bisi, or someone else that knows more details (like HondaFan81) will be glad to point you in the right direction, I'm sure. You PROBABLY wouldn't want a race header for a bone-stock F22...

[LinX]

Not sure if this has been asked before but will this new h22 header be CARB approved for those that live in CA?

[uslspct]

I will definitely be purchasing one at some point. And now I'm subscribed to this thread for further info

I'm never gotten a straight response to this question...What if you have a 2.25" exhaust from cat back and then you get this or any header with a larger diameter collector? Should you always upgrade the exhaust tubing to be the same or bigger than the collector or not necessarily?

[starkrice]

Not sure if this has been asked before but will this new h22 header be CARB approved for those that live in CA?

SAME HEAR

[owequitit]

I have an H22 header question too.

If you were to make 2 versions, what would you set up as the dividing line between "street" and "race?"

Also, do your designs clear all accessories, or are they built solely for maximum power output?

Just trying to get my bearings here.

Thanks for thinking of us Bisi!

[F20A CB7]

well i think 4-1 for a stock accord is ideal because youll have lil more power in the higher end which cb7s lack in, but i think the best exhaust is 2.25.

but u said street and RACE

the street dia size is it 2.25 or 2.5

because i rather have a 4-1 on a stock motor to free up the high end flow, but if the outlet size is 2.5 wont runnin 2.5 from cat back b best.

even i still think 2.5 is still a lil 2 much for my motor a 2.0 sohc .

it doesnt make sense to go from 2.5 out on header to 2.25 pipin

[Granite CB7]

Any updates Bisi? I'm def. going to be 1 of the 1st on the list, I've been holding out for one of your headers for awhile now

[F20A CB7]

he said he has to header styles, 1 street 1 strip

the STRIP is 600 bucks

what about the STREET one, how much will that be?? and whats DIFF about it than strip

[Bisimoto]

Both street and race units will hover in the 600 range. The street has a straight pipe, and the strip has an incorporated megaphone.

[LinX]

Not sure if this has been asked before but will this new h22 header be CARB approved for those that live in CA?

bump

[Hondatuner998]

Hey Bisi, any idea when they are going to be ready for purchase? And what kind of horsepower and torque gains are you seeing?