The B&B manifold,er,muffler,is very noisy and I very much doubt would come anywhere near a DB level of 93.Its advantages are its small and cheap.
Ijust put a Ryobi converted with a bisson muffler and B&B mount on it on my trusty mail scale and it came in at about 42oz.a CH black box and a small battery pack will run about 6oz.Memory tells me a Ryobi flywheel and coil are just about 16oz,and are displaced by the CH setup.You can do the math and comparisons to a G23,US engines 35,Quadra 35,etc....and factoring in the cost of a CH conversion decide whether its right for you.
I like the conversion since it fits in the fuse better without the flywheel,the black box and battery pack can be moved around for CG purposes,the CH unit can be used on other engines,and if I ever get tired of it can be easily sold.
My $C.04 worth......