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David David is offline
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Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 8,718
The stock ports are 36mm, they just taper down to 32mm at the intake manifold. I discovered this when I opened mine up to 40mm for the Carrera intake.

Also keep in mind that small ports don't limit flow until sonic velocity is reached. They do have a little more pressure drop (head loss) though.
2014 Cayman S
2011 Cayenne Turbo
1979 930 (475 rwhp at 0.95 bar)

Last edited by David; 02-02-2010 at 05:42 PM..
Old 02-02-2010, 05:40 PM
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