stock turbo + MBC = boost taper theory

[Kracka]

I definitely think each individual application has an ideal bleed-hole size; going too large could obviously hurt the MBC's performance.

My thinking is a slightly enlarged bleed hole would allow the wastegate to snap shut more quickly under high boost conditions, in turn allowing the turbo to run slightly more boost. I'm thinking the bleed hole may not be large enough to let enough air escape which ends up just holding the wastegate open longer causing the taper.