Expected weight saving and power gain vs. original exhaust:OptionPowerTorqueWeight Race Titanium Silencer Slip-On Kit - Moto Gp Style Megaphone1.3 bhp @ 9050 rpm1.0 ft/lb @ 9000 rpm-1.6 kgOptional 4-2-1 Stainless Racing Header Set6.7 bhp @ 7100 rpm9.4...