Had some leftover white coroplast and used it to fill the tunnel area and used clips in the stock holes
Front pipe area, as you can see the frame starts to curve upward so that was about as far forward as I could go.
Have it all the way back meeting up with my Borla muffler which fills in the rest of the tunnel void
It is up against the pipe as it gets close to the Borla so some of it will melt