I would estimate between 7-8 lbs. Wasn't really concerned about weight savings seen how bike weighs 600 pounds plus. Wanted a little sound :). Bike seems to pull a little better. Hope I gained a few ponies with the K&N air filter and exhaust.
You will like the excel throttle control. Very well designed, easy to use, and rider friendly. Used mine for approximately 2500 kms last year. Great piece of kit. Enjoy!!!