So I was just fiddle'n around on google checking out custom air horns and what not and came across this. Anyone tried it?

Pusher Cross-Air for Cummins 5.9L turbo diesel engines in 1998.5-2002 Dodge Ram trucks.

 

Never tried it, but thought about it. Personally, I don't think it is worth it for a DD, tower, or anything less than one looking for all out power. Even then, if you want all out power you may be looking at shaving the intake off, and a custom manifold. There are guys hitting over 700hp without a manifold like this.