actually the GA intake manifold is not that bad, take it off and look at it, 
maybe extrude honing it would deburr it, but that doesn't port it.  I was 
quoted about 300 for the intake from the Irwin plant.  My uncle said we could 
build a intake and make it for that much.  I am considering this because the 
STR intake on the honda really made a difference.  The stock intake on ours 
is designed for all range power, it seems that those shorter runners make 
more quick response and higher RPM power too.  
            Chris 92 classic



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