header vs log style exhaust 12valve

[p7100]

What's the most efficent style for diesel and in this case 12valve cummins.

I have a header (6 individual pipes to turbo flange) right now but leaning back towards a log style manifold.

Because i have a feel that the truck did have some better push with log style but it can also depend on some other mods.

Therefor i'm asking you guys if i should sell the header and build a log style one.

 

[CorneliusRox]

http://www.competitiondiesel.com/forums/showthread.php?t=174989&highlight=header

My opinion is, they might perform better at higher rpms (post 4000rpm), but a divided log style is going to be better in almost every way. (packaging, durability, low end torque, spool-up)

 

[p7100]

Ok thanks for the answer.
After reading that thread it feels pretty much like what my truck felt like.
Very slow in low end and aggresive in top end.