I wonder what sort of time improvement you would see with some aero mods? Front splitter, rear wing...simple stuff to make, and cheap. Plywood will do the job just fine.
And for those of you now shaking your head at me:
That's one of the guys from the Ottawa Subaru club. A weekend, some plywood, and a piece of vinyl siding cut 2 seconds off his lap times at that track:
http://www.ottawasubaru.com/forum/viewtopic.php?t=14520
So waddaya think? It wouldn't be too hard to rig a splitter or wing on an SVX.