install price i'm not 100% sure on... I had m+a do the following: Trans, diff, front axles, clutch, turn + install flywheel, slave cylinder, tic klunk killer bushings, tic holy shift, turn rotors + install pads, and spark plugs and it was just over $850. I supplied my own fluids.
Here goes the painful part:
Diff i got off ebay from a wrecked 04 auto forester xt for $340 shipped. I bought the trans on nasioc from a dude who said it occassionally would grind going into 4th and 5th at high rpm for $550 + $75 for a new slave cylinder and the sti braided clutch line. I had it inspected then rebuilt with all new synchros, which meant updated (upgraded) hubs for 3/4 and 5/r plus a couple seals. Rebuild, parts, and 4 qts motul gear300 + 1qt redline synchromesh was ~$1100. Clutch i pieced together.. Brand new exedy stage 2 pp, brand new act organic disc, and the previously mentioned reconditioned act 13.9lb flywheel for ~$500. I also had to swap to female front axles which cost me another $150. Add in group n trans mount... $70? I don't remember.
Oh yea and i drove to washington dc and back to pick up the trans when it was complete, however much that is worth. It seems like a lot of money listing this all out, but i've been piecing this setup together for months and with the exception of the diff and the trans, which was completely refreshed, everything is zero miles parts.
You can all laugh at me now for not doing a used six speed + parts for more or less the same cost
But i'm pretty thrilled with the car as it is, and i know full well what it will be like with another 100 or so whp.