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Installed my FMF 4.1 Titanium in anodized blue with carbon end cap and megabomb header yesterday. I know some weights have been posted but just wanted to share my results. Busted out the shipping scale and found a pretty substantial difference of 3 pounds! I've only ridden it with the spark arrestor installed on the green plug map (stock) but...

Got my 16 about a month ago.... Absolutely love it. Coming from a KLX400 (DRZ400) this thing is like a mountain bike with 55 hp! Just took it to silver lake sand dunes this weekend and couldn't be happier with the performance. I've ridden my buddies 450s (CRF, YZF, KTM) and this is the best feeling 450 I think...