The wastegate allows extra exhaust gases to pass by, without forcing them through the turbo (prevents "overboost" if you will). This will allow boost to be more stable, etc. I don't believe going to a bigger wastegate without changing the entire turbo (if you can just replace that piece) would result in better performance. wikipedia wastegate to learn how they work.
Don't waste your money on aftermarket actuators. We'll fix your stock one up right on Saturday.
His: 01 F-250 Lariat, 7.3, ZF-6, NV271
Hers: 06 Freestar SEL 4.2l
79 Bronco Ranger XLT.. used be the driver, now waiting to become the project.
96 Grand Marquis LS... 25 mpg commuter
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