Jose,
I am far from an expert here but some statements don't make sense. "As for mounting location, the further you mount the turbo away from the heat source the more lag it will have." "I have several customers running the STS sytle system which are now switching back to a conventional system due to the lag created from the heat loss."
Now, heat is a negative for all engine induction systems. It is very misleading to say that further from the heat you get more lag and lag is created from heat loss. While, if you take a standard turbo that it used in the standard setup and place it back in the exhaust flow to where the temps are lower, that turbo's efficiency might be effected, it would simply be a case of redesigning a turbo for that application just as you would any thing else. Certainly the idea of less heat transfer is notable, even if you don't subscribe to the whole relocation idea.
Now back to your original comments. Again, I am no engineer, tuner, builder, expert or anything but if the turbos are designed to turn X,XXX at XXXX temperatures then the turbo "should" be MORE efficient when the exhaust temperature is lower. My reasoning behind this is that colder air is more dense than warmer air (same idea as on the intake side) and since the air is colder and more dense it would be spinning the turbo more, not less.
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