You guys know you can have custom NASCAR style
flat rectangle pipe sections made for crossing under frame sections where needed a 1"X 4" = 4" pipe if you need that much exhaust. Or a 1"X 3"=3". NASCAR runs them from the header to the exhaust point & the flow is the same & so is the sound
That is my plan; @ least under the frame points. But as usual, life's event have my conversion postponed. But I will get there one day soon.
Just find a local muffler shop/ or just about any skilled fabricator/welder can make theses sections up for you with out huge cost either!