The block huggers didn't work on my application on the steering side so it looks like we're heading into custom fab territory. After reading Grumpy's comments on determining optimum header size I wonder what effect design/shape has on enhancing or diminishing performance when the original manufacturer's design is compromised through custom fabrication just to make things fit.
Grumpy, would you like to share some thoughts on header efficiency from both a size and design standpoint?