 The stinger (or spark arrestor as Suzuki calls it) exits the exhaust system at the end of the external shell.At the front of each pipe was a small forward-facing grille which allowed cool ambient air to be forced into the pipe by the bike's forward motion and to travel the length of the exhaust between the internal and external pipes.It then flowed through the holes drilled in the stinger, mixing with the hot exhaust gasses before exiting the system.