sure there are disadvantages. there are disatvantages with everything. If no one has ever tried it then why not try it? If you have never done it or seen it done then why put it down?
Not trying to put you down dude, just trying to save you from wasting a ton of time on fabricating a system that has obvious flaws. While I see they are not obvious to you or they are and you just aren't pointing them out, I have been around long enough and built enough high HP motors in everything from mud runners to jet boats, sleds and just about everything in between. So I can tell you from experience the following (again): it won't be significantly lighter if at all, the physical amount of material is more or equal, so therefore by a galatically accepted universal law whereby matter cannot be created nor destroyed, you won't lose weight from this system compared to a single silencer. Just the same as I said before, a silencer for a twin is designed for a twin pipe, not to be run off a single. Since twin pipes flow more, your silencers will flow more than a single pipe silencer thereby reducing backpressure which will probably have a negative effect on the HP your motor produces since 2 stroke motors basically require a tuned pipe to make power and scavenge the cylinders. Without the proper backpressure in the silencer, you may not achieve the same pressure waves in the pipes to maximize its power and design.
You have yet to discuss your ideas of "advantages" as you keep calling them. What ADVANTAGE are you looking for? We have said it will likely decrease or maintain your same level of performance. It will likely increase or maintain the same weight of the current system (unless you are using a suitcase muffler then you will lose some weight). So, apart from that.....what other advantage are you looking for? Sound? Twin silencers may give you that "cool" sound, or they might just reduce your performance. But hey, they'll sound cool.......kinda like a Honda Civic with a coffee can.....
If you want two pipes sticking out of the bottom of the sled then weld another pipe onto the bottom of your current silencer for show. Not trying to bag on you man, do whatever you want.
BTW, your analogy of climbing a hill was a nice try, the real analogy here is all your friends are saying "wow that looks really steep and 99% chance you'll roll your sled if you attempt it and don't make the top" and then you hit it and wreck your sled, all your friends are going to be saying "we told you so".
