I had big ness honkers for about two weeks and they were too loud for me so I went to S1L2. The honkers were relentless, great for blasting above 3,000 RPM, but they had a driving blat noise at cruising speed. They made nearly all the gearbox whines undetectable.
The S1L2 have a big vee motor rumble at cruising speed and a bit of a bark under acceleration. I am happy with them and will not be changing them.
I believe L2 are quieter than L1 and I know honkers are louder than both L! and L2.
I would like to know which are supposed to give the best power and economy. I suspect the honkers would allow the engine to breathe the most, but some motors like a bit of back pressure.
2010 Black Vision Tour Premium, S1L2, lower wind deflectors, ABS & reverse