Running art plus invidia for approx 500 miles. When first installed there was a hiss on decel, that has significantly gone away. As for drone/rasp, no drone, very little and I mean little rasp (cant stop it completely running any kind of non-res pipes). The invida was rumored to have the smallest drone/rasp when combined with tp/art pipes, this has been true in my experience, 2600-3200 rpm, you would think it was stock.
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