I currently have the cfr's. If i add the v@h dresser duals how much louder should i expect it to get? And will it change the sound much?
The CFRs will definitely be much louder when paired with an 'open' header such as the Dresser Duals that does not have the catalytic converter intact simply because the cat does muffle the sound quite a bit. With that, we've had folks say that running them with an open header makes the bike too loud for their liking, especially when making long interstate runs BUT there are others who say that the sound level is perfect. It's really a matter of personal preference.
What I will sometimes recommend folks doing if they are concerned that they may be too loud with an open header is to run them for a while on the stock header with the cat intact to see how they like it. If after that they don't feel they are loud enough, then they can invest in an open header in an effort to get more sound.
Hopefully this helps!!
Lindsey :0)