R don't mean race I believe it means Red. 93 is street chip for 93 octane, 100 for 100 oct, 106/107/108 etc. They are rich and have lotsa timing. No tuning but fuel psi and using boost rod to +- the boost. Went 12.15 with R93 but dropped to 11.77 with Translator Gen2 Extreme G chip and LS1 maf at same boost level. Tech has come a long way.