SELECT MIN("Capacity") FROM table_63011 WHERE "Class" = 'cm22' AND "Vehicle" = '1999 subaru impreza wrx sti'
Which Capacity has a Class of cm22, and a Vehicle of 1999 subaru impreza wrx sti?
CREATE TABLE table_63011 (
    "Driver" text,
    "Navigator" text,
    "Vehicle" text,
    "Class" text,
    "Capacity" real,
    "Total Time" text,
    "Margin" text
)