I posted that incase anyone else was wondering. I spent a week or so on various forums and chatting to others and the answers I got varied from it'll be fine right through to itll warp the heads !!
I just wanted to point out that the ECU will adjust the fuelling. It will lose some torque but that will be the only downside. There will be no harm done.
Having run it baffle free over the weekend there is no noticeable difference in performance apart from losing a little low end grunt while actually gaining a bit top end and the sound is just how I'd like it.
One guy yesterday had run baffle free for three years and his Bob is fine. Obviously if your changing the intake then you need to do other work but on a standard Bob just changing the exhaust will do no harm.

 

Do whatever floats your boat. When I changed the pipes on my 2010 superglide it seemed fine until I hit about 70 in 5th

 

I will be the first to trumpet loud pipes, but I am also of the opinion that anyone that runs open pipes on the street is an idiot, for 3 reasons, it sounds like ****, does not help the motor run better AT ALL, and finally you create enemies of non-bikers who are likely to raise a stink and whine about your noise. That does not help any of us.

 

Is that a random comment or aimed at me ?

1. I've removed the baffle from the slipon muffler. Gives it a deep but louder sound. Quite a few comments on how well it sounded actually but it's down to personal taste I suppose.
2. I never said it would make the engine run better. I lost a bit of power low down but gained top end. A compromise for the better sound I get now.
3. An 83 year old non biker pulled out on and killed a biker two days ago here because they failed to see or hear him. You think I really care what non bikers think of me for removing the baffles ?

Still, what do I know, I'm just an idiot...