I've come across this custom system from HMS a few months ago. Looks and sounds awesome
, I like the sound a lot. Costs including shipping to US appear to be close to that of Arka ( shipping alone is close to $800 ). Made to order.
These images I received from the company in an official response to a request for a quote, so I hope they don't mind me posting it here.
There are no reviews except one very short on Youtube and a dyno run again on YT from the HMS web page. If someone in EU could buy it and do a proper review I would truly appreciate it, as it's hard to plunge $4K on an exhaust that could be not perfect in some way.