1) Releasing more exhaust 
==History == The history of Fier is bound up with that of the oil, gas and bitumen deposits nearby. The presence of asphalt and burning escapes of natural gas in the vicinity was recorded as early as the 1st century AD. Dioscorides, in Materia Medica, describes lumps of bitumen in the adjacent river Seman, and the concentrated pitch on the banks o...