How many models have maximum power output is 162kw (220 ps) at 6,300 rpm?
CREATE TABLE "specifications" (
  "model" text,
  "engine" text,
  "displacement" text,
  "max_power_output" text,
  "peak_torque" text,
  "0_100km_h_s_0_62mph_s" text,
  "top_speed" text,
  "co_2_emissions" text,
  "years" text,
  "note" text,
  "engine_code" text
);
SELECT COUNT("model") FROM "specifications" WHERE "max_power_output"='162kW (220 PS) at 6,300 rpm';