Given equal discharges from the engine and equal turbochargers, the velocity is directly related to the heat of the exhaust. More distance means more heat loss and lower velocity. Also lower exhaust energy at the turbine, which is no coincidence.

To increase the exhaust energy, insulate your manifold to keep the heat from escaping.

Thats a good way to crack the manifold too.

Yes it is. I was about to add the text, "If the manifold can take it," but didn't.

I do agree with the cooling causing a loss, also, a longer pipe creates more backpressure in the system, which hinders power. I don't know about heat wrapping a pipe going into a turbo, those bearings are sensitive as it is to heat being the harsh environment they are already in.
Now, I could possibly see some benefit in a creatively designed venturi type setup, use an oversized pipe off the engine and reduce it to normal size just entering the turbo, gas flows faster thru the smaller opening to maintain equal flow. Starting with an oversize pipe to a normal size also prevents creating excessive restriction.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale