5 speed swaps are very common on those cars. But if you wanna stay auto, the 4R gears and 3.08 or 2.73 rear would probably make the most sense. Adjust the air ride sensors to drop the car as low as it will go.
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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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