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The boost increase will bump up your power of course, the exhaust just lets that power come in sooner.
This is where the line is drawn between turbo and N/a gas engines. These performance upgrades can help your mpg with a turbo, but usually not with n/a. More torque down low can help mpg.
Of course thats only if youre driving for mpg lol.
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'05 Outback XT, 19 mpg
BP-turbo 93 Festiva (long gone)
1/4 mile - 12.50@111.5
Best MPG - 36.8
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