Yea, exactly. Like gears rolling over. Very faint. Like I said, I almost like it.
U have it and the D4 doesn't change it? That correct?
I know my Mustang T56 Magnum made a little of this and a lot of some more offensive noises
I already bought the D4. I was considering buying one qt of the Redline MTL and doing a 3:1 mix to thicken it slightly under the theory it would mitigate noise transmission. A couple of Corvette guys swear by it in their TR6060s. Haven't seen where anyone on this forum tried it.