double s sell a system w/out the mid box for 189 delivered... ordered one for my disco, they phoned up & said there was a problem with the mid pipe so I could have one with a middle box for the same price (usually a lot more)- result! good quality but no louder than standard with the mid box
What do you mean by max torque cam shaft? And what else are you doing to it?
Remember if you are going for performance, there is little point in making the manifold free flowing and leaving the manifold standard, as thay will be your bottleneck. Try Ashley Performance Exhausts, we have used them for lots of stuff in the past. Sounds lovely too. Last time we bought an exhaust for the V8 they had them on the shelf.