Without a donor car, the cost will be enormous. This is a very bad idea. Trade cars and get a manual.
The 2002 Subaru Legacy has a 5-speed manual.
The 2008 Subaru Legacy has a 5-speed manual.
The 2011 Subaru Legacy has a 6-speed manual.
The 2013 Subaru Legacy has a 6-speed manual.
The 2009 Subaru Legacy has a 5-speed manual.
The 2006 Subaru Legacy has a 5-speed manual.
The 2005 Subaru Legacy has a 5-speed manual.
The 2014 Subaru Legacy has a 6-speed manual.
The 2010 Subaru Legacy has a 6-speed manual.
The 2012 Subaru Legacy has a 6-speed manual.
The 2003 Subaru Legacy has a 5-speed manual.
The 2001 Subaru Legacy has a 5-speed manual.