There was just a discussion on this at fordfestiva.com. Stock size is probably best, but do not go over 2 inch. The lil B3 doesnt need much.
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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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