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They don't.
You will lose a little bit of HP because the wastegated cylinders will run a bit more rich at full boost, however, this may be good, and act to gradually round off the hp as it approaches the wastegate full-open/full-boost position.
When the wastegate opens on a single wastegate/twin scroll installation, half of the cylinders will see a decrease in exhaust pressure. Temp=pressure*volume/boltzmann constant*# of moles.
The ONLY thing that changes when the wastegate opens is the EXHAUST pressure on half the cylinders. A reduction in exhaust pressure equals a corresponding DECREASE in EGT in the wastegated cylinders.
As long as the single wastegate can vent off enough exhaust to ensure there is no overboost condition occuring, it works just fine.
The cylinders are a constant displacement device, which means that the compression in the cylinder and the amount of exhaust exiting any one of the cylinders WILL BE THE SAME no matter WHAT happens on the exhaust side. The ONLY thing that changes is exhaust PRESSURE and, subsequently, EGT.
If you are running high-overlap cams, there will be a slight increase in the amount of blow-through seen by the engine during the overlap condition. In that case, the wastegated cylinders will ingest more air/fuel charge due to overlap. The air/fuel in the wastegated cylinders actually DECREASES and it runs MORE rich. Why? Because air moves faster than fuel, and moves out of the cylinder easier and faster. Once the exhaust valve closes, the trapped air/fuel charge is enriched slightly, usually by about -0.5 AF. Any differences seen an be tuned around, so no big issue, esp. if you have per cylinder trim on your ECU.
The reason to run two wastegates is to ensure that the cylinder AF balance is "perfect" all the time, and, that there is enough vented exhaust to ensure no overboost condition. No other reason to do it.
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