I must ad that I upgraded from "tweaked" SRT manifolds to Crossover NW's sheet metal manifolds. So, the whine [read wildcat howl] was the first thing I noticed and I can't compare to NW's non-crossover phonics.

Either way, tapping the throttle just the slightest bit releases a neat pitch akin to a cat. An angry big toothed cat...lol. Too cool.