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That HAI thread is somewhat old. I switched out the PVC piping to the stiff dryer aluminum duct using the same concept. You can always use the aluminum downspout gutters. Try to keep at least a 1.5" diameter, but 3" diameter piping is better b/c you're not restricting anything at wide open throttle. Also, if you put a HAI, you really want a scan gauge, odbII scanner with live data, or remote thermometer to help tell you what the incoming temperature is.
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