For a wagon, try a factory WRX sedan rear anti-sway bar first. This may be to your liking. The wagon doesn't need as much rear bar to achieve the same handling as the sedan because of slightly more rear weight bias.

I put on a Cusco three-way adjustable rear bar and added Whiteline billet end links later. Nothing done to the front end. The rear sway bar made a big difference in the way my car handled. Braking into corners made the car turn in much better but after driving it this way for several months I recently re-adjusted the bar to a less aggressive setting because it was hard to brake into a turn without the rear sliding wider than I wanted on tight twisties. It's really fun on the street, though.

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0==WW==0
"…axles of evil…" - george w. bush

 

i asked the same question in the transmission forum and someone answered with a good reply. Heres the link

https://www.i-club.com/forums/showth...threadid=38902