All of the aftermarket mufflers for the 650 add about 5-6HP and weigh a LOT less then the stock one. If you want to hear them youtube has dozens of examples. I think the staintune makes it sound like the DL1K but am going to put on the scorpion for the price.
Man... I still have a carbon fiber Scorpion laying around in my garage for the 650 because I can't decide whether I want to install it or not. I really don't want it to drone on the highway.. it's quiet enough to ride without earplugs as it is, just afraid the Scorpion will be a headache on long trips.
5-6HP is what I read but I'd like to see the dyno if anyone can find it. I do know the weight savings is pretty significant.
IMHO the 650 with the scorp sounds a lot like the 1000, the staintune sounds exactly like the 1000 with stock muffler. Check out the youtube video's on wee exhausts to listen to them.
Personally I always wear earplugs for long rides. The wind noise alone can cause serious hearing damage. I personally believe that riding without earplugs is responsible for my horrible hearing. Also with plugs in I can hear my communicator better.
People always talk about the increase in power or the sound of an aftermarket muffler/pipe. In my opinion, the weight decrease is a pretty significant benefit that's often overlooked. Stock mufflers weigh a ton, shedding some of that weight has to have handling benefits, no?
I've heard that by replacing the stock pipe your bike can lose as much as five pounds, which is a pretty significant amount. Shedding that much weight definitely takes priority over sounding cool, but fortunately the two come together, or so they tell me.
I don't know about power gain, I don't notice any seat of the pants dino results. I do get better gas mileage by 1 or 2 mpg. I do like the looks over stock and I love the sound with the baffle in. The price of my Staintune was high but that's what I wanted, to each his own. If we all liked the same thing we would have cookie cutters.
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