Ok, I came across something today that I haven’t seen before. Here is a set of pipes on an Invader that have the bell shaped flange. So they can’t be git kit pipes right? All of the kit pipes have the sleeve style coupler. But they’re not 4/6 pipes, they have too many springs, 4/6 pipes only have 2. They aren’t Ltd or Interceptor pipes, they have two piece flanges, these have the one piece flange.
What are they?