Hey you didn't get any reply because you kind of posted in the wrong place, you wanted to post here:
Also there seems to be another storefront that popped up on DHgate, maybe used to be active in the past... And there is this modular piece with blue accents, removable downstem and mouthpiece Well now they got me, despite the language barrier they are going to make a spare holed downstem to...
fuckcombustion.com
Many people have bought and asked about this piece, I have it from another seller so I don't know how good the quality is on this one or if they are reliable, but the joint connections are 18 mm female (the removable down stems have 22 mm connection) I got it with out the matrix perc or the ash catcher, just the main can with circ perc and the mouthpiece (which I hate and sold separately) a lot of the photos are just stock photos not even the exact piece so it's hard to know what will be different seller to sellers just go by the reviews and price etc. You can ask when you order, or by messaging, if they can send you one without a logo, or you can just figure out how to remove the logo when it arrives...
Pros are the modularity, cons are the perk and the size of the piece, I'm not such a fan and I really never use mine, but decided not to sell it lol I have other modular pieces you see I posted in the thread above that I prefer