This was second one from Cobra parts. paid 599.00 for #1. #2 was free. It worked very well for 6 months and started running rich then quit after about one week. Talked to a fellow named Phil at Cobra first and they sent me a new one in the box at no charge. No more even if free. i'll try something different. Have V/H 2-1 pipe w/Magnaflow glasspack 2.25 inch. Thunder aircleaner w/stock cover. V/H muffler was OK but Magnaflow sounds better(quieter) and a runs little better. Gas mileage not much of a concern for me. May try a Cobra Fi2000R. Way less expensive. Don in North Alabama.