Exhaust manifold design

[Rippthrough]

Tubular manis that actually do anything would need to tuned to match and for an XUD which doesnt really rev high enough isnt really worth it...plus it costs a LOT of money.
Plus when you consider what bhp those big diesels get on those manifolds, IE about 175bhp per litre, I wouldnt argue with their methods

The whole point of a pulse tuned manifold is that it's tuned to the correct RPM range.
A rotary bent manifold will give you everything bar the last nth percent as compared to a mandrel bent, you usually only need to use mandrel bent stuff when your struggling for packaging.
175bhp per litre from a big turbo....so basically bog standard Evo power then.....