So I'm on the hunt for a can to mount on my B&T GHM9. I'm interested in a flow through/low back pressure system, and this particular KGM model has my attention. The other option is the full size B&T SQD RBS 9, but it seems to have a reputation for not being all that quiet despite it's size and weight.

KGM seems to have a good reputation, save for some friction when they shut down direct sales for a while to focus on .gov contracts. It looks like they're back, though.

I suppose the Huxwrx Rad 9 is a good third option as well.