Coating would RAISE EGTs since its keeping more heat in the manifold.

Sorry to dig up this old thread. I have a couple of questions. It looks like the turbo connects directly to the intake manifold. Is it possible to re-clock the stock turbo in such a manner as to permit access to the hose connection points on the turbo (air output) and intake. From there, if it will work, it is really just a matter of plumbing, right? I really don't want to have to weld on my intake manifold.

As for the coatings I have heard of coatings on intake bits lowering intake temps (makes sense) but never an exhaust coating lowering exhaust temps.

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1985 300D

Yes, loosen the 6 bolts on the back of the compressor housing and it will rotate 360*. The intake has no way of attaching a hose you you will have to cut a lip in the manifold or weld a fitting on it. If you want to attach something to the intake, you will have to remove it either way.

Coating the exhaust does not lower exhaust temperature, it keeps heat in. Keeping it in the manifold makes the turbo work more efficiently with less backpressure.

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.