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Registered
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,861
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In all honesty, I don't get a sense that header diameter is a big constraint with most 911 motors. Having a slight step from the exhaust port to a slighty larger primary tube isn't a bad thing either. But going too big in the header size results in the loss of exhaust velocity which makes scavenging harder.
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John
'69 911E
"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
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