If I want to run higher boost will I need a bigger wastegate?
Running higher boost doesn't require a larger wastegate, in fact in most situations running lower boost requires a larger wastegate than high boost applications. The wastegate flows exhaust out to lower the boost level. The lower the boost requirements, the more exhaust has to flow through the wastegate valve.
The more powerful the engine, the bigger the wastegate you need?
This is one of the more popular misconceptions. Use this simple guide before setting out to find the biggest wastegate you can afford.
Big Turbo/Low Boost = Bigger Wastegate
Big Turbo/High Boost = Smaller Wastegate
Small Turbo/High Boost = Smaller Wastegate
Small Turbo/Low Boost = Bigger Wastegate