I have a Sony Xperia SP running jelly bean 4.1. I wish to root my device using the Doomlord exploit and run kitkat 4.4. But will that affect the working of the Bravia Engine 2 in my device in any way?
The bravia engine would need to be included in the new ROM you are installing. It is a software screen enhancement.
The Sony Mobile BRAVIA Engine 3 is a video enhancement program for Sony phones. It uses filters and algorithms to create a clearer and more contrasted picture and an overall smoother experience.
Alternatively there are often flashable zip file mods for the bravia engine for different devices.