If you have a rusty Hbox, getting rid of air box, Murrays Mikuni kit, or switching to newer mufflers............this is the easiest way to upgrade. It cost me $140 at a muffler shop for 2 bent up foot and half sections of muffler pipe. All you need to do is decide location of muffler and weld it
Doesnt get any easier
Here's a picture of Murray's upswept extensions mocked up (not cut or welded) on my '79 project:
I'm waiting to cut them and have them welded because I plan on a more conservative look for this bike.....the upsweeps will go on the next build.
The mufflers are 17" Emgo Shorty Dunstalls.....removable, re-packable baffles. There is plenty of the extensions inside the mufflers....I slid them down where they are because I liked the position visually.....they could go up another 6" or so if you wanted.
They are an easy set of pipes to work with provided you plan first and then double check before cutting anything off. Save yourself the hassle now and pull the centres out of the mufflers, get some muffler packing (not the stuff that looks all fluffy like) and repack them. The strainer was something I found in a Link that Murray sent me, and for the $4 in strainers + 3 good tack welds, it was worth it. It really cut the noise down (and they are NOISY)
I can send you some pics if need, just let me know