Here are two pictures of the two model of equal length headers that iON Performance Inc in Canada has designed and is currently testing.

4-2-1 Equal Length Turbo Header


4-1 Turbo Header


If you have questions, you should contact them at ionperformance@yahoo.com

 

They both look well made, but neither of them look equal length to me. Not that that's a bad thing, IMO.

Mark.

 

GTB Guy,

Are you Jack from Ion Performance?

Moray

 

not so keen on the tapering angle of the 4 into 1 section on the turbo headers, but then I do like the fact that they look seriously unequal.

I know being in canada it probably isnt worth you getting a banner on here, so at the risk of another picking you up for posting it, how much are they?

 

Morray - yes you're correct. This post was ment as an info post.

Adam - they run $1199US+shipping ~ 840GBP's (that's normal retail). However, for Scoobynet, i-Club, Club STi etc, it'll run $950USD + shipping ~667GBP. But as an intro offer they'll run $899USD + shipping ~630GBP.

 

The 4 into 1 manifold is the spitting image of the HKS tubular manifold that I fitted to my car, must be a popular design

 

ok
so you have got two designs can you tell us what is the advantages and disadvantages or each ?

 

Tim, HKS must be the most copied in the world. If you have them, everyone MUST wont them.

Dan

 

OK guys here's more info :

The 4-2-1 unit will have more low-end vs. the 4-1 units. The 4-1 style units were designed in mind more for a Drag situation, and hence will provide more peak power vs. the 4-2-1 style unit. Also, the 4-1 style unit allows you to use any cat-less up-pipe or even cat'd up-pipe you have on your car currently. The 4-1 style is just more flexible in those terms. However, the 4-2-1 style is more of a true equal length, as it has less than 1% deviation in runner length etc. The 4-1 style unit deviates about 2-3% from true ideal equal length.

I hope that helps answers questions. The intro offer is only good for 2-3weeks.

 

Just for everyone's information. Introduction prices are only valid till December 7th, 2001.

 

Bump - no takers?

 

> The 4-1 style unit deviates about 2-3% from true ideal
> equal length.
>
From the picture, it's obvious that the 4-1 has two pipes about 30cm longer than the other two. That's not 2-3%, it's about 50% !
I'm not saying it doesn't perform, but there's no way it's equal length.

Regs

Steve

 

Does the 4-1 manifold come with an up pipe ? What do they do for the sound?

It is a shame you aren't doing this offer later on next year , just don't have the money at the moment
Dave

 

StephenDone - you're correct in terms of physical length, but you have to remember gasses behave differently. The runners on the drivers side (on a LHD car), are actually smaller in inner diameter than the passanger side. Thus keeping EGV's high, the runners on the passanger side (on a LHD car) are larger, hence equalizing the effective "length" of the gas' travel before the collector.

Big Bear - the 4-1 header's advantage is that you can use your existing up-pipe. Otherwise, if you want a 1 piece unit, I'd get the 4-2-1.

 

Fair enough, but you didn't mention that before ;-)

Let's see some comparative dyno plots then !

Steve

 

StephenDone - I'll definately post them when I get them. Please keep in mind cars in North America are de-tuned... as well, we have "****" as petrol (91 Octane).

 

Oh dear <grin>, that's a shame. I knew there was a reason why I lived here (UK) !

Oh well, comparative dyno plots will still show the difference that the headers make, fuel type remaining constant.

Cheers

Steve