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I have the TRD exhaust and I don't notice any drone from it. It is silent when cruising below 3,000rpm and roars when it goes over 4,000rpm. I downshift more often now just to hear the satisfying roar.
That being said, I only have it because it came with the car when I purchased it. I'm planning to switch to another exhaust when I have the chance because I prefer round tips over the D-shaped tips.
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