After finding a full length crack in the header pipe off the rear cylinder of my '07 Ultra at the crossover pipe, I took the exhaust pipes off and had them welded to repair at my mechanics assurance that it would be stronger than the original. Now I find putting the pipes back in a challenge. The pipes are not going back together very easily and I am sure someone has a tip for sliding these pipes together for the installation. Any experts that would like to give me a clue? Thank you in advance!