When you run high boost (upgraded turbo) you need more fuel that the stock fuel delivery system can provide. Usually just upgraded injectors are enought, but due to the stock fuel rails design, cylinder #3 tends to be a little lower on pressure than the other 4, meaning it can run lean under high demand and detonate. The solution is to upgrade the fuel rails to a setup that can flow more fuel and provide more even fuel pressure to the injectors.
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