The 086 pipe is too small for a .36 engine. It was designed for .21-.28 engines.
The .36 does not flow any more fuel than an Axial 32, LRP Spec 3 or Picco 28, the run times are almost identical in the Savage. It might make more power than the Axial, but the LRP and Piccos will out run it. I have not put an Axial 32 in an XL chassis yet, so I cannot really compare the two.
There is the Ofna style header in the XL chassis.
I think this is where the confusion started, I think, when you run the standard chassis, you need a header designed to work with the stock shock tower. The XL chassis has all the header room you will ever need. Bud