[asshanson]

Boost creep may be from only having a single small wastegate not being able to bleed off enough exhaust gas, but I thought the main benefit of having the twin scroll is so that the exhaust pulses match up in each chamber for better spool. If you combine them with a single wastegate, some of the exhaust makes its way into the other chamber, which reduces the spool up benefits of twin scroll. At least that is my take on the issue.