Here is what I did for my first manifold.

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The egt's are not raised- they are kept the same, which allows the gasses to exit the engine more quickly. Here is a good explanation:
If gases are allowed to cool they loose mass which causes them to lose velocity which reduces the scavenging effect. By insulating the exhaust pipe the gases are kept at the highest possible temperature which improves the scavenging effect and reduces underhood temperature.

Interior coatings on exhaust systems are very important, they help the exhaust gas retain its heat and it reduces part temperature, oxidation and corrosion.

My egt's do not get over 1000f unless my speed is over 70mph, and then only if I am accelerating. If I am cruising at 70 mph and "floor it", then around 85 mph do I get over 1100. If I stay at that speed (85), the egt's lower to around 900. If I start from a stand still I'll get high egt's with a full throttle run to 90. The stock turbo(s) inherently generate high egt's at higher rpm's. I'm happy with the set-up for many reasons. Everything is a compromise, and when you raise one variable, you effect many others.