Quote:
Originally Posted by b00fa
...Where the slipon joins the head pipe the diameter on a 08/09 I believe is bigger than whats on the 06/07 models, I don't know the size but I can get back to you with it later today or tomorrow.
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That is why I posed the question, but I thought the slip-on mid-pipe was actually
smaller than the collector on the 06-07 header just not sure by how much. My understanding was the mid-pipe was larger diameter on the earlier systems since the cats are in the mufflers as opposed on the 08 and up.
Hopefully it is an easy fix since I just ordered a CS One system.

It will be part of a larger mod to my Concours converting it over to a dual system, pulling the flies and adding a PCV.