Purchase advice Civic Type-R

Hello, it’s about the Civic Type-R with 200 hp from 2000/2001 (?) Did he have the 6-speed transmission from the beginning? Was there a differential lock installed from the factory? The facelift has the lighter flywheel and is supposed to be a bit better. Can someone confirm this from the practice? Was there an air conditioner to order? What should be paid particular attention when searching, year of construction, vulnerabilities, extras etc.?