Expected weight saving and power gain vs. original exhaust:OptionPowerTorqueWeight Road Legal Carbon Silencer Slip-On Kit - Hexagonal0.8 bhp @ 7450 rpm0.6 ft/lb @ 4600 rpm-2.0 kgRoad Legal SP Titanium Slip-On Kit - Hexagonal0.8 bhp @ 7450 rpm0.6 ft/lb...