Motorcycle Repair: straight pipes for a harley rocker, drag pipes, straight pipes

Question
I am going to buy a Harley Rocker in the spring. I have seen some really cool looking pipes that don't have baffles in them. I am told that this is called a straight pipe. Someone told me that straight pipes can damage your engine or cause poor performace or the like. What can you tell me about straigt pipes in a rocker.

Answer
Your bike comes from the factory running a little lean. Adding "drag pipes" will make it run leaner, so you would have to remapp the bike in order to get it back to running right. The other thing is "drag pipes" make you lose some performance in the low end and mid range, where most people ride
Good luck and happy riding
Mike