Does this really give me more horsepower and mpg as it says?
http://cgi.ebay.com/ebaymotors/REAL-PERFORMANCE-CHIP-JEEP-CHEROKEE-1997-1998-1999_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQhashZitem4a99db7721QQitemZ320408876833QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
