They go for $595...I have been quoted for quaife, fidanza flywheel, and clutch install between $700-$1000. It's recommended you do all at the same time as you will save on install, since it can cost you $800 3 times, or $800 once.

Make sure you bring it to a reputable place as the quaife is not necessarily a direct fit, and may require machining.

i bought mine from spmotorsports.com for $595...or something like that...he usually cuts me and others deals if you order a few things.

1995 Probe GT ATX TOO MANY MODS
1999 Cougar V6 MTX
Stage 1: (Basic Mods)B&M STS, Bassani Exhaust, KKM intake w/ weapon R pipe, ProFlow 75mm MAF w/optimiser, YoDude Y-pipe w/hi flow cat, SVT TB, SVT Upper IM, OMP FSTB,AF gauge, Aerogear fiberglass hood (completed)
Stage 2: (Top End Work) 19-24lb injectors, P&P heads w larger valves and HPC coated, P&P and port matched lower intake manifold also HPC coated, custom ground cams, Ford Racing 9mm wires, Bosch +4 plugs, Custom burned PAC or Diablo chip (will dyno with both), Apexi SAFC (In Progress)
Stage 3: (Transmission) Quaife LSD, CM stage 3 Clutch, Fidanza flywheel (In progress)
Stage 4: (Suspension)Koni adjustibles, H&R springs, Progress 21mm rear anti sway bar (Installing on Tues)
Current dyno: 172.9 whp with just bolt ons and stock exhaust manifolds (not gutted), oh, and bad wires smile...