Thanks for the info, I am planning to re-jet the carb, pair valve blocks, and go to the K&N Filter that fits the stock air box at the same time as the pipes. Hopefully the K&N filter will make the difference in air flow, I don't think the cover itself would cause any restriction. From looking at the pictures I have seen of the pipes It looks like they would stick out at least a little further than the side covers. I am wondering how much farther and if that puts more heat on the rider. The deep throaty sounds are what I am looking for, I am glad to hear they are fairly mellow when running down the road at least for the rider and passenger.I would really like to hear a set but may go ahead and pull the trigger so I can have them within a couple of weeks.