It does not work. On some cars, it would provide a slight boost in the right weather, but your subaru is too smart for it. Its hard on the engine anyway.
[url=http://www.thawa.net/gallery/albums/album108/DSCF0330.jpg]90 legacy of awesomeness[/url]
THey are sappose to work MAP based cars, at least the ones I looked at a few years ago. Our cars are MAF based.
91 Pearl White Sport Sedan
04 Java Black Pearl Forester XT
2014 Volvo S60 T5
18 KTM 1290 Adventure S
87 Grey GL-10 Sedan (so long old buddy) - donated
97 Toyota 4Runner SR5 - sold
2002 BMW r1150rt-p - sold
2004 BMW r1200ST - sold
2016 BMW r1200RS - sold