Hello all. I'm a 06 YZ450F owner. Does anyone know if the weight savings is significant from the stock exhaust vs. one of the lightest titanium aftermarket exhaust systems? I'd like to get one with the spark arrestor built in. Some claim as much as 3 pounds weight savings. Anyone know if this is accurate? Oh, one other question about the FMF "powerbomb". Is this a gimmick? Every aftermarket exhaust I've ever used, I couldn't tell any difference in the power. - As if it is lacking in the first place.