Darren-
Thanks for asking. Volant does not supply an approximate Horsepower or Torque gain for this intake but average for an XJ Cherokee with an intake is about 10hp and 15 ft/lbs. of torque. Volant offers a one year limited warranty from the date of retail purchase to be free of defects in material and workmanship to the original purchaser. It is not warranted against normal wear, misuse or abuse.