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I hear this pinging noise when idling, I have a manual transmission. When i'm accelerating all I can hear is the stock intake sucking in air.. almost like a whine noise.. very hot if you ask me.. At higher gears on the highway I usually run about 3500 -3800 RPMs at all times on the high way in 6th gear, and don't hear pinging at all.
THough when I idle and put my window down I can hear it, or if I pull up to a drive through its rather loud as well. Overall if you stand a foot and a half away from my car you won't know its running though if its idling.
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