As far as reliability mods go...
- The clutch is substandard so upgrading to a heavy duty unit is an improvement
- The valve which limits the speed at which the clutch engages gives the clutch a spongy feeling and if you drive hard you will wear the clutch out faster. There is a DIY removal article somewhere on here or NT.com
- Change the transaxle lube to Redline MT-90
- Do an engine flush and change to a high quality synthetic oil and Wix oil filters
- Change to steel braided brake cables
- Install an oil cooler
- Change to polyurethane bushings
- Install a large gauge ground distribution kit
- Re-wire alternator, starter, and fuse box to battery leads with 4 gauge or 2 gauge cable
- Install a voltage stabilizer
- Install an oil catch can
- Install real gauges so that you can monitor oil pressure, oil temp, coolant temp, and voltage
- Install a wideband O2 sensor and gauge to monitor actual air/fuel ratio to ensure that it's where you want it to be
That's about all I could think of in a few minutes.
