I thought the Impreza was only an AWD, wikipedia proves me wrong but does state:
So you may struggle to find a 2WD one from the more powerful engines.
You can convert the Subi boxes (the same ones are used across virtually all of their platforms, not just the Impreza) to 2WD on either output, either just using what would have been the FWD and not use the tail output or you can disable what would have been the FWD output and just use the tail output.
Either way, I am sure there was a reason why either the Subi 5sp or 6sp couldn't be used in the SL-C... I tried searching through more threads last night but I still couldn't find the reason.
To try and keep costs (and weight) WAAAAY down I'm trying to get away with a fairly stock VQ35DE and a subi 5sp transaxle (the 6sp weighs a LOT more but is invariably a LOT stronger).
I really want to make that 2000-2200lbs SL-C (with interior!) a reality.