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I don't really know what they sound like compared to the rest of the various engine noises, nothing stands out to me as being a noisy injector though.
OK. I'm running a bottle of Liqui Moly benzin fuel system cleaner from their pro range now. It's 500ml so its quite big compared to most others. So far my car feels more powerful to the point where I'm chirping my Toyo Proxes T1 Sports at 9000 rpm 1st to 2nd shifts