Expected weight saving and power gain vs. original exhaust:OptionPowerTorqueWeight Road Legal Carbon Silencer Slip-On Kit1.1 bhp @ 10200 rpm1.4 ft/lb @ 3250 rpm-2.4 kgRace Carbon Silencer Slip-On Kit0.9 bhp @ 9350 rpm0.6 ft/lb @ 4850 rpm-1.3 kgRace Carbon...