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I want to point out something I may have not made obvious. DO NOT run the stock DI system and just turn the injectors off. That is what Max did when he had failures with his drift car and it would be the same case in the FA20. If you leave the stock DI injectors in you MUST run at least some volume of fuel through them.
It's also worth noting that the stock piston is obviously designed to run a DI injector and of course I would recommend an aftermarket piston properly designed for the application.
Pistons melt from prolonged knock or pre-detonation not because they aren't being sprayed with fuel. Granted the stock piston has a lot of hot spots that will make a potential knock scenario worse but they are present with or without the DI.
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