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I spoke with the guys at forcedinductions.com about this years ago and they basically said you could ballpark it if you took a standard 76mm turbo compressor map and shifted the graph 10lb/min to the right since it flowed more.
Take the below image from their site and move the island 10 lb/min to the right. Then you'll have an idea based on how much boost you want to run and your NA air consumption.