+1 with Hackish comment
I have a 2001 Outback sedan, factory exhaust is a power kill. Not sure how well the new ones do, but I can tell you the 00-04 Outback/Legacy had a terrible exhaust. Quiet, but HP restricting. And it sounds dumb to say when you'er trying to conserve gasoline, but having the AWD parasite loss, extra power allows you to stay in top gear longer/entirely for hills.
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