Rx8 Engine Identification

You have an Rx8 and you don't know if it is a 4-Port or a 6-Port.

In the United States at least, from the factory the following applies:

Years: 2004-2005
All cars with manual transmissions have 6-port engines.
All cars with automatic transmissions have 4-port engines.

Years: 2006-2008
All cars with manual transmissions have 6-port engines.
High power automatic cars have 6-port engines.
Low (standard) power automatic cars have 4-port engines.

Years: 2009-2011
All cars had 6-port engines.