A little late, but I thought it might be useful to add to the discussion.
I too came across these replica-like slip-ons when browsing through the Aliexpress addons. I say replica-like deliberately, because there is a range of options - as there usually are with chinese products. I found a chinese Leo Vince muffler that didn't hide what it was; sticker, embossed label and even an EC approval (for non-Europeans, that's a type approval label required on all newer aftermarket exhausts within the EU). I doubt Leo Vince has factories in China, so this is just another case of the Chinese churning out cheaper intentional copies. However, then there are other universal mufflers. Basically, these are visual copies of Akrapovic/Yoshimuras with an optional sticker should you want to add it. Without the sticker, it really looks like a no-name muffler.
Anyways, from what I was also able to find (and this is the important part
), just buying the muffler alone is not enough. You also need the connecting part; they call it the mid-pipe. Here
is an example. I was unable to find one on ebay, but this part seems to be the equivalent of the custom made adapter that was featured in the linked video by StaRn3ss
There are very few reviews out there and according to Aliexpress numbers, only one person actually bought the thing so far (the mid-pipe I mean. The mufflers are selling like crazy, as you'd imagine), so I just might give it a try and report back whether it's worth it. For under 100USD total, it's not such a terrible idea, especially for those of us who are looking to try something that does not sound like the stock muffler and does not cost upwards of 500 USD.