Speaking of glasspacks, I ordered 1 from summit the other day for the '51, it should be here today or tomorrow. I ordered the 2" by 31 1/2" long. I ordered a glasspack because I knew a tube muffler would be an easy install and it was 16.95, I was thinking about a patriot Smithy's muffler but got the cheaper Thrush Magnum Glasspack. When it comes I'm getting all the other pipes and pipes bent locally so, I can put it all togther.