[fitfan]

does not really matter, as its the tune, with whatever you put on, where the power is to be gained.

 

[Julian73]

Not NA info but out BOE's site for testing of a number of header types. They dont sell any so Phils goal was to find best for his car (which was a SC version)

 

[komiko]

Apparently they are as much of a "plug" in the exhaust as the cat. If I had more cash right now.....

 

[holmz]

Hi which is the best header for the 2zzge normaly aspired ?:shrug:
elise/exige 111r

In the good ol days the cam, compression, induction lengths, and exhaust lengths were all chosen to use resonance to increase the volumetric efficiency, and fine tuned with lobe centers spacing and advance.
The 4 valve head made all the cam side a whole lot easier.

These days an exhaust that over scavenges can be just fine and dandy because the cam can be somewhat adjusted (more so on Honda than a Toyota).

So the best exhaust may also not be a 4:2:1 and it may also change if you are running cams other than stock.

The bottom line is that the 'best' maybe a particular 4:1 on some track, and another particular 4:2:1 on another, and some different variety altogether for something else.
It depends what "Best" means?
(It could be a combination of performance <power, torque, drivability>, or reliability, or cost...)

So stock cams and intake?, road?, altitude?, etc....?
What would define best for you?

 

[race]

i have a new set of cams stage 2 and remap with stage 2 exhaust and cup airbox with C-ONE gearbox...

 

[holmz]

What is the intended use?
And what constitutes good or best?

 

[race]

75/100 track and 25/100 road
have more torque,,

 

[holmz]

75/100 track and 25/100 road
have more torque,,

If more torque means more torque higher in the RPM range (which also means more HP) then a 4:1 might actually be optimum.
If more torque means Auto-X below the "second cam", then the 4:2:1 might be better.
On old skool engines, the 4:2:1 gives a wider power band, but on these modern engines with varying degrees of cam control the need for induction and exhaust being tuned for the cam is somewhat mitigated, as the cam can be tuned to exhaust and induction.

There are 2 ways to go...
1) One is get an exhaust designed (e.g. Burns, or someone with some S/W that works out the optimal lengths)
2) Find something that seems about right that already exists that looks about right.

I suspect it might take a while, and whether it is critical to get the last few HP depends...

This fellow is one of the best with Toyota 2zz and has a few engines run on the Nurburgring 24 hour as well as other events. Home
There is no one finer.