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Just about all modern engines are now direct injected. Very few experience any sort of carbon buildup. This was super common on early DI engines but is mostly a non-issue by this point. If you have a nearly new WRX you should be fine.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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