i have been running my D and D's with the baffles removed but as I said before, I could really tell the difference in top end power loss. Today I took 2 exhaust pipes from Oreilly's and cut 16 one inch slots in them, one inch apart and bent one side in as shown to create new baffles. I then started closing the end of the pipe down a little at a time until I was happy with the power on top end again. I will probably make a few more adjustments as I go along but the bike sounds great and runs great. May be a little too loud for some folks but I really like the full megaphone sound I have now.