Theyre NOT ' fake ' exhaust stacks .
there live very Engine Bay Cooling EXHAUSTS . !
Irvine 40 RE in the last one , with a vertical ' tounge ' ish muffler up into the duct ,
and the very smoke came out the very stacks .
Have to see , youd think these stunt pro's would sell ' tank vent outlet grommets , like 1/2 x 5/32 formed finishers for HOLES for
removeable tank - vents . Though the other ways to do a fixed external thingo , hose connected to tank , so the tank removes with the filler / vent
remaining fixed & finished .