SZ, Stillen and B&B - if I remember correctly, SZ had them beat by close to 20 lbs. SZ has smaller mufflers w/thinner material and uses thinner wall tubing. If smaller mufflers and lighter tubing works so well and saves weight - why wouldnt you want it? I have the Stillen and the weight of the materials feels like it should be on a tank - overkill for sure.