Hello again Africanlion,
YouTube presented another video to me unsolicited and unresearched, but I thought you might be interested because its main focus is on the benefit of turbocharging at high density altitudes.
https://www.youtube.com/watch?v=y8-VaGQ-_8Y
Of course Bundu Aviation would be delighted to oblige you by fitting such improvements, as stated in their video
https://www.youtube.com/watch?v=ZKNKX0jJwKM