Vacuum lines also have a response time, depending on the source (and I don't just mean before or after the throttle body). For example providing the wastegate actuator with a signal after the intercooler will net you more power due to the turbo having to reach a higher pressure to compensate losses imposed by the IC before it'll reach the actuator spring's pressure. The downside is that due to the significant lag you'll see surges in boost and air temp.... not so good.
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