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?