The Kleenex box with a built-in blower is nothing to sneeze at.
It's naughty.
Valve covers obviously panned out well, so I'll take the liberty to suggest a muffin pan exhaust manifold with dual exhaust/tail light combo.
Perhaps a couple of old tapered/flare able leg (or kids baseball bats?) with length TBD will work to scale and flow with frame. Shorty drag pipes or full twins shooting out under the seat.
Maybe with flashing speed holes.
A tank/plate and frame could offer support for any extended pipes.
An ironic name change idea with the Muffin pan mod and existing equipment and would be 'The Loafer'.