CM works well with a OEM DMF. Might be fine on the synchros, but I can’t say for sure because I installed upgraded synchros at the same time.Is there an aftermarket clutch that won't destroy syncros? I'm looking for a replacement flywheel and clutch due to wear and hotspots while my engine is out. Most people online are running Clutchmasters kits with seemingly no issues, but they also haven't given any updates in 2+ years since they put it in.
Stick with the FX250 or FX100 for longer life. My FX400 is still hanging in after a bit over two years and at least 20,000 miles.