I'm on my 4th one now. Dunno how many more in the future, I think there are no more left here, I have them all! Oh wait, #3 I sold to mechanic kid and I sometimes see it on the road. Anyway, if you can get rid of all emisions, its pretty easy to replace the intake hose with silicone tube. I had driveability problems that was due to bad intake hose and bad AFM. Those AFMs by now are all flaky, hard to find a good one. In a pinch, you might be able to use silicone tape, but not sure if it'll conform enough to the ridges to make an airtight seal. Stuff is not cheap, you'll see it under brand of Rescue Tape, you can also find same stuff at some home improvement hardware stores for cheaper with no branding.
NA Mr2 tranny actually has same ratios as the FX16, the SC MR2 is a different beast, not realy good in the FX16 unless you're running boost, I'd say. But as was mentioned, the shifter shaft exits wrong side. You can however take all the rest of the internal bits and put it into a FX16 case, that's what I did when I rebuilt mine. Theres a good chance your synchros are worn out and bearings worn. The bearings often cause the common 5th gear pop-out.
I've dropped the transaxle so many times now, on a good day I can change it out in one night by myself, actually I did it twice in one night once because like a bubble head I installed the clutch friction plate backwards! A couple jacks, wood blocks, engine hoist, couple ratcheting tie down straps, and two guide pins fabricated out of bolts that fit the top two transaxle to bellhousing bolts with heads cut off and I've got a system down.
For aftermarket, its tough, gotta get creative. If you do the flywheel, you can use flywheel and clutch speced for the last gen Celica or MR-S. I'm running an Exedy Hyper Single clutch & flywheel. Kinda overkill.
KAAZ makes a LSD for our transaxle. Unless you know how it drives though, I don't recommend one for street. It's almost like opposite of torque steer, coming out of a corner and applying power, the steering will fight you and try to go straight. I use it for dirt and its awesome for that, prob number one improvement for dirt up there with tires. Also, if you've got crappy driveshafts, like pretty much any aftermarket OEM replacement shafts and run really hard with LSD, you'll break driveshafts. I broke more than a couple.
I finally went custom driveshafts from The Driveshaft Shop. They can pretty much build you any shaft as long as you can get them specs and sample parts.
I have a Whiteline adjustable anti-sway for rear, but they no longer make it.
I'm running TRD springs, also hard to find, with Koni one way adjustable insert dampers. OEM strut casing up front, modified OEM AE92 rear casing in rear. KMAC camber kit to fix rear camber.
MOMO tiny steering wheel with MOMO hub adapter.
AE92 short shift kit (JDM) that I modified further by cut & welding the shift shaft.
Sears Platinum AGM Battery relocated to rear in custom box cut into the spare tire well.
Speedline Corse wheels with rally tires.
This little FX16 gives a wake up call to all the STi's at our rallyCross!
