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Well imo, Mongoose or Magnex do the system for the Valver (inc. de-cat pipe). They do a 3" and 3.5" round tailpipe (Mongoose) which is a good size, sits nice, and isn't over the top. Also give a nice sound, especially when you go over 4k rpm.
Or you can have a look at K-Tec's options, they also do a de-cat pipe or a silenced de-cat pipe.