MD5 checksum is a 128-bit hash value (32 characters). Use checksum values. In practice, checksum values are mainly used in three situations. First, checksum value can be used to check data integrity when data is sent through telecommunication networks such as Internet.
Performance Exhaust System. The main purpose of an exhaust system is undoubtedly to route the spent exhaust gas out of the car's engine. Along the way the exhaust gasses may be used to drive a turbocharger and now-a-days it will most definitely incorporate a catalyst converter to reduce carbon dioxide emissions.
they 'purge' the system as when the cars are sitting on the start line for a while the engine heat turns the no2 in the line into a gas which is what they don't want. It is then 'purged' into atmosphere to get all the gas out of the line and ensure there is liquid ready to go when they nail it.