What is the difference in the Heavy breather for a 07 touring bike and a 08 softail? There is a local add that has a Heavy breather for sale for a steal but it is for a 08 and later softail or dyna. But it my bike and the on 08's have the same motor why would I not be able to use this kit on my 07 street glide? Any help on this issue would be greatly appreciated.