Howl is caused by intake, rather than exhaust. 558's engines are lifed on number of full cycles idle/full/idle, so current display needs to be less throttle-happy than previously. Also, handling more gentle now for conservation......... and a front spar mod scheduled for the Winter, so no wing waving or the like.
Still a beautiful sight & sound though, and howling magnificently at take-off & in power-climb.
