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hmm, 20k to get it to 400-500hp at a reliable level? I usually dont play tuning scenarios out but lets say you get the motor from Rotary Reliablity (close by shop, supposedly top quality work). 13B from them with 3mm ceramic seals and hayes o-rings, pretty much the works for 5500. That 13B running on the stock turbo should last quite some time with those kinda upgrades. Upgrade the turbo, run higher boost levels, and the motor should stay intact for up to 80k miles if properly maintained. What do you think? Sound over optimistic? A couple of the guys on the forum have over 100k miles on the original engine while others have burned them out after putting only about 3k on. Sounds like it has to do a lot with maintanince,
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Mazda RX-7 FC3S: Jspec motor, ported turbo & wastegate, JIC FLT-A2 coilovers, Mazdatrix adj. rear camber link, TB mod, Koyo 53mm Radiator, Corksport Cat back/midpipe/downipe, 3" Al TID, Apex'i air cleaner, Mazda Comp. mission/motor/differential mounts, Mazdaspeed Strut Bar(R), FD torsen differential, HKS SSQV, HKS elec. boost gauge & elec water temp, Cusco Oil catch, 680cc secondary's, Walbro 255, Banzai Racing FCD, RB DTSS Eliminator bushings, Exedy Clutch & PP, Exedy chrome moly flywheel, RB oil baffle, RB dual alt. pulley, 5 lug conversion, FC3S.org thermal bypass pellet, KVR Cross drilled rotors, complete Energy PU bushings, stainless steel brake lines/clutch line, Aerodyne shroud panel, Azenis RS, and some other stuff. A hybrid of sorts I guess 
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