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Something does not add up. You can't just add more air and make more power, you have to add more fuel too, and the stock fueling system will only flow so much.
Careful with this DIY boost mod. Have you looked at the compressor efficiency map for your turbo? With increasing boost you have to carefully watch what you are doing. There's a reason the stock boost limit is where it was set at by the manufacturer. If you push it too much too early, or at too high rpm, you'll grenade your turbo, especially at your altitude.
The 55 mpg on the highway seems high. You should make a fuel log and look at the long term trend.
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