I've just had a stainless exhaust system fitted to my YRV Premium and retained the original Daihatsu tailpipe because it has a rolled-in (stainless?) outlet which looks better than a simple pipe.
If any YRV or Sirion M100 owner is interested in having this for free they are welcome to collect it from South Oxfordshire, not far from Reading. Just private message me. I'll keep it for a week or two and then chuck it if nobody wants it.