I've rode maybe fifty miles after having installed the EFI silencer, and I've noticed the silencer is already starting to turn gold in places, and the pipe underneath the foot peg is fairly blue - did I do something wrong? What do I do now?
The blue part of the pipe under the footpeg must have been blue before the muffler change. The muffler change wouldn't all of a sudden cause it; that's where the hot tube is inside the header pipe. Until you cut that out you don't have a "free flow" exhaust & it will just get bluer. Shine light up there, you'll see it.
Unless I'm totally wrong & there is no hot tube in the UCEs. In that case ignore all of the above.
But why else would the pipe under the footpeg be blue?