Well some of us have/had issues with it some don't. mine is non res system with sports cat. I had to weld mine few times, when it was quite new, drone on motorway is present, not as a perfect fitment as it should be. You would expect top quality work for the price.
Thanks for your feedback S, that's handy to know.
I'll make sure to bring it up with the remappers (Storm Devs) as £850+ is a lot of money to part ways with, especially if you're not getting the quality that you'd expect!