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So maths is not your forte then? :p
Volume = Area x Length
In your example (presuming the internal diameter of the pipe is 50mm):
Volume = [π x r^2] x L
Volume = [π x (2.5cm x 2.5cm)] x (420cm)
Volume = [19.6] x 420cm
Volume = 8232 cc
Volume = [π x r^2] x L
Volume = [π x (2.5cm x 2.5cm)] x...
I've got an airbag computer if you want to send it off to be reset, so that you can keep yours in the car until you can swap them over. Give me a PM if interested
Mine was fine at starting for about 6 months when the trip computer / clock kept resetting, it started first time every time and the voltage was fairly spot on. One day the battery just suddenly died! Not bad for an 8 year old battery tbh ;) Popped a new battery in and it was perfect again.