This.Without being rude, I suspect the price of a manual over an auto car is a lot less than the cost of converting an auto to manual?
New EMS, remove TCU and wiring, new trans, new rear prop, new front shafts, new pedal box, new rear diff (matching FDR's), new gearshifter, new trans X-member, are my starters for ten.
If you do convert it would probably be cheapest to buy a manual Impreza that is wrecked and swap the bits over (caveat you need spacers for the trasn X-member).
Simon
And to add, you need a clutch, flywheel, pressure plate, clutch slave and master cylinders, and the interior trim bits.
Oh, and your ABS won't work properly without electronic tampering.