I'm glade you are excited about the possibility of more performance. The exhaust manifold that genos sells looks to be very nice, I have not seen it or talked to anyone that has one. But the ideal of insulating the manifold and useing all of the heat (energy) that is available is sound and adviseable. Turbo's work or drive off of heat, so the better the delivery system is at keeping that heat the better the turbo will perform. Most want increased power, but few seem to notice that extra power is very much within their reach, and it's not that expensive to obtain.
I insulated my exhaust manifold myself, I made a cover that conforms to the shape of the manifold and is deep enough to insulate it's sides as well. For the matterials I used ThermoTec products, they have a wide assortment of insulating heat barriers, blankets and coverings. I found all of their products were of great quality and performed as advertised, I am sure you will like them as well. After the manifold cover was fashioned, I made a cover for the exhaust side of the trubo, one for the down tube (52") and one for the area between the turbo and pac-brake. In all the results were fantastic, under hood temps were reduced and turbo performance was increased. You can easily duplicate my success, just take the time and putforth the effort, the rest will come.
I also insulated the Intake air system, my challenge was to protect the in-comming air charge from picking up unwanted heat, and continue to protect it from heat soaking after it had been charged. I have a few pictures that show you some of what I did to insulate and issolate the heat.
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Good luck with your efforts!