500A at ignition voltage? Using the factory 12v coil? Fired into an automotive spark plug?
Bull sh!7.
A lit charge is a lit charge, the factory ignition components reliably light the charge unless you have some other failure to overcome (fouling, wrong mixture,etc) or a very dense air charge then there is almost nothing to be gained over the stock ignition components.
Don’t know what the 80 runs for voltage but 20,000 volts would be very conservative, 500A @ 20,000V is 10 million watts. Think about this and take a look at your stock coil. Even with an extremely short duty cycle the power is just not there.
There are capacitance ignition systems used in turbine engines that push power like that but
A. the plug would never survive,
B. cost whole lot more than $200 for a system that only pushes 2 igniters (plugs)
C. much bigger than a dinky capacitor that would fit in a spark plug tube.