I'm not sure that's enough...take a look at drysumpjet's initial post in this thread. What he did was overkill for a straight pipe, but looks to be very strong. An excellent solution, in my opinion. That OEM muffler shield is pretty flimsy and isn't designed to have all that other stuff hanging off it. The exhaust port is carrying some of the load, too.
Those F-cub mufflers aren't particularly light.
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