[nateW]

The C90 is way different.
You can't really de baffle do to the fact that the muffler is mounted sideways under the bike between the rear tire and the transmission.
The pipes out the back are basically fake look like muffler assemblies.
The best way out is to replace the pipes. Drop the 30 pound muffler out from under the bike and move on.
On top of that the hard krome 3 inch big straights sound so good.