Just a couple for those who might be interested. Added a Pro Circuit T4 exhaust. Nice unit but loud, as others have reported. Although PC said they modified the quiet tip that you can buy separately so that it will be quieter than before, don't do it -- it doesn't do much. Instead, at the suggestion of another person on this forum, I took the stock tip out (just remove the bolt that holds it in) and it fits right into the end of the PC pipe -- barely! It runs up against the spark arrester but does just fit. Just drill a hole in the top of the PC cone (a little awkward -- best if you have a vise -- but totally doable). Also, I bought seal savers and as others reported they are kinda lame -- two short. So I went to REI and bought a 3mm neoprene dual wine bottle holder for $16. Just cut out nice long pieces of neoprene and sew them together (I don't really know how to sew so I just winged it -- works fine). I used rayon bundled thread that I got at a local crafts store and large sewing needles. After a test day in the dust and dirt they are sweet (IMHO). I'll try to post pics of both.