I have the full stainless from W&N, it is super easy to install, fits perfectly to the stock manifolds from the Euro 635. (I mention this because I think there is a difference between older US engine manifolds as it pertains to the angle of the opening but I'm not sure). Anyhow, the sound is a little louder even though there is a silencer and muffler. It's louder at all speeds but definitely not annoying (IMO). I like the chrome tailpipe w/o the end piece but my car is not really stock in any sense of the word. The cost is around 1K and sometimes W&N has a 49.00 shipping special- which I was able to get in on. Just my 2 cents.
I have my car on the lift today working on headlight adjustments so if there is a need for pictures please let me know.