and here is another vote for the Skandix exhaust... I have the 140 system on my 140 and the 120 system actually looks a bit better than the 140 design IMO because it doesn't actually use a first muffler, it's just that long resonating tube, and the main muffler out back.

I think they are R sport copies actually. Good stuff. Classic Motorports used one on their 120 WHEEL horsepower engine FWIW.

The reason that these systems work so well, are quiet, and actually improve performance a good deal, is because they are mandrel bent and the design of their mufflers. Many other exhausts that you might get made have crush bent curves and use chambered mufflers. They are usually larger diamter and sometimes louder without making more or sometimes even as much power as a well designed 2" system is.
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Kyle - '68 142? - Oregon Volvo Tuners?