Ok, so after a very long call.....it's going to be a trial and error approach.
Initial setup -
2 custom made straight through high flow boxes
Cat back SS pipes - 2 inch
No mid box
X pipe
If that's no good, add 2 small mid boxes.
Should be with the guy Monday for a week - let's see the outcome. Definitely going to make a trip down there mid week to catch up with him.
I've sent hours and hours this week finding a viable solution to the droning sound without loosing the sound of the exhaust.
I'm excited to see what happens.
Will post up pics as and when I get them.