Starts better in the cold, adds alittle Horsepower, and increases throttle response.
Its funny my plug came in different packaging. It was grayish tan instead of Blue. Same part number I bought it at Napa too!I would really go with the NGK IRIDIUM thats a very good plug. Worth every bit of $10.00. Part number is BKR5EIX-11 napa part number is 5464.