I agree it would look better out the back, will be a bit of a challenge to get all the bends right.
The mufflers are made using .100 evergreen rod and very thin sheet material. I cut 3 same length pieces of rod (what ever length you want the muffler to be) and glue them flat side by side. Then cut the sheet the same length and wide enough so it wraps around the rod with a bit of overlap. I cut small pieces of thre thin sheet for the ends and trim and sand them to the shape of the oval ends of the muffler.