The stock DA muffle is 5 oz, and the Slimline pitts is 11 oz. so you would have to add that to my weight.
Nogyro
I am using Slimline pitt muffler. If you're right about the weight, You're Edge would weight 17lb 1oz+6oz=17lb 7oz near 17.5lbs with the Slimline muffler which makes sens when we compare yours and my Edge.
I would have to put the rx pack in the spinner to balance the CG at 4.75'' and DA muffler