The G10 head has square exhaust ports, roughly equivalent to a 1"-1.25" diameter round pipe. I'm guessing you'll want primaries smaller than that. Suprf1y on TeamSwift or GeoMetroForum knows a lot about these engines too, I'd ask him for recommendations as well.
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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