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I know what your talking about, this is just a guess but I'm gonna say the direct injection plays big part in the sound. You can hear the ticking at idle, there's a lot of psi of fuel which I can see can affect the overall tone of the engine. Plus we red line at 7k rpm and 4th gens are 6k, so the exhaust tone up high will sound higher pitched. Besides being only .2 liters difference in size there's prolly not lot in common between the two engines lol
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