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i have a hypertech. it's done everything i've wanted it to and it was super easy to put on. nothing at all against diablo havent heard anything but good things about them. but from experience hypertech is also worth the money.
pinging is caused by ignition of the gas/air mix in your cylinder before the spark of the spark plug. This causes temperature and pressure peaks that will melt your piston, crack your cylinder head, and drop one of your exhaust valves.