Hello from the Bay Area, CA,
Thanks for the great site. Many user recommendations have been incorporated for powering up my new (to me) WR250R. Made AIS modifications, dumped EXUP added FMF Q4 and controller, changed tires to a DS 50/50 and the bike isn't the same. Power, smooth roll on the tarmac and sounds like a dirt bike.
Plan on adding my experience to the wealth of shared information on this site.