The default C90b is done very well. I flew one for quite a few years till my retirement from our federal government. The engines are modeled extremely well. They are the PT6-21 which on a warm day temp out easy in the rw and that is present here. It was the first aircraft i flew after installing X-P 11 and it's an easy machine to like.

I've modded the C90B to PT6-135 standard as those engines provide constant boom up to 18000 ft. Wish I had time to add some of the other mods offered by Blackhawk.

One thing that the model definitely needs is a 2D popup for the AP and EFIS control panels. You can only do so much with the quick views...

I agree 100% with your comment about a pop up for the AP & EFIS control panels.....that would be my only complaint (minor).

For me I like the -21 engines as they are.....I got so used to them. Used to spend a couple weeks a year in a level c/d sim for training. I flew it from 2010 to 2016 when I could get out of the office. The last 7 years of my career I was mainly an office monkey as I called it...90% office...10% flying. About two years before retirement they fitted a G1000 cockpit to it right down to XM radio and nexrad wx radar.....neat stuff after the steam panel.  

Now 3months after getting X-P with a few  payware aircraft and some truly great scenery I may not reinstall P3d again.