Well, as JCZ said
The stock CVO muffler is the best looking one in my opinion, and I really love it's look.
well, i vivsted the FullSac website and i got little confused
they said that for the stage 1 CVO 110 i have to do 3 steps
one of the steps is:
stock headpipe is replaced with the Fullsac X-Pipe.
which i dont really like
so my question can i only buy their CVO POWER CORE to insert it into the stock muffler
knowing that i already installed the stage 1 tuner card, so the only thing i miss is changing the muffler
CVO2012 - YES, you can most definitely buy only the cores and change them out with your stock ones.
Suggest you call or email Steve at Fullsac and discuss what you want to do with him - he is EXTREMELY knowledgeable and ready to help - he has helped a LOT of us on this site.
Once you make your decision let us know - we're all very interested in what you do with your ride.
Also, once your parts come in, if you need any tips/pointers/advice on the install, just search the site for it - there are MANY of us that have completed this install and posted our experiences here.
Good Luck
Sparky