I have the 3" cobra slips, and I just finished my experiment with baffles in and out. After taking them out and riding a little, my opinion is that they are now louder, obnoxious, and I need to put my baffles back in. They also have that tinny sound I do not like after taking the baffles out.
Also, I am with Exred about the back pressure issue.
So, make your choice and enjoy the results.
velociraptor intake; Cannella black riser; dyno tuned; black & white spikes
Cobra 3" slips (baffles in); Memphis Shades pop top sportshield; iso-driver boards
Fi2000R, ~120 mls LED lights; C&C SportTour seat; Rebel Bandit ReFlash Hog