not sure what the emissions laws are in your neck o the woods, but in CA diesels, motorcycles and pre-74 gassers are smog exempt.

check out this previous thread, good reading -

http://www.peachparts.com/shopforum/showthread.php?threadid=75194&highlight=truth+emissions

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'79 300D "Jaeger"
'61 VW Baja "Frosch"
'92 Honda Shadow 600
'80 Honda 185 (cafe project)