Did you ever hear what you were looking for? This Sunday a bunch of us are getting together in Owosso with our bikes. Most of them will be VTXs. You will definitely be able to hear various exhausts on the 1300 -- V&H Big Shots for sure, but also my bike (1300C), which has Hard Krome 3" Big Straights. If you hear my pipes and like them, I will tell you that the Bubs sound even better -- the best sounding pipes for the 1300, IMHO. If you will be coming, let me know, and I will be sure to ride this particular bike.
See
this link for more information on this Sunday's get-together in Owosso.
I have not heard Speedster Longs yet, as far as I know. I am wanting to hear these in person myself, though on an 1800.