What is the maximum torque at rpm for the engine with code BMM?
CREATE TABLE "engine_specifications" (
  "engine_name" text,
  "engine_code_s" text,
  "valvetrain" text,
  "displacement" text,
  "max_power_at_rpm" text,
  "max_torque_at_rpm" text
);
SELECT "max_torque_at_rpm" FROM "engine_specifications" WHERE "engine_code_s"='bmm';