[BLSTIC]

Because of the lower temperatures back there, the volume and pressure of the gasses flowing through the turbo is lower by the time it gets back there, despite the mass being the same. The result of *that* is that the turbine extracts less energy from the exhaust, and the exhaust physically fits through the turbine and its housing easier. Both of which are also important symptoms of a larger turbine wheel and housing.

However, you don't get the added mechanical advantage of having a larger turbine wheel by just plonking it at the back. I'm certain that proper housing design could entirely compensate for this though should you wish to have that effect, by having a small area, large diameter housing. I wouldn't be surprised if that's what STS do.

So it's not *exactly* the same, but it's a rough emulation