DC Sports Header install and evaluation

[tooter]

Originally Posted by xnamerxx

Depends on how they are designed, but if both are designed correctly there should be almost no difference.

The 1NZ FE engine's firing order is 1-3-4-2.

A 4-2-1 tri Y header pairs up sequentially firing cylinders 2-1 and 3-4 so that the exhaust pulse from one helps to draw exhaust from the other.





Then the combined 2-1 and 3-4 pairs join to help scavange each other...



Practically speaking, the headers are too short to make a lot of difference.

But that's where namer comes in...