1993 Nissan P35

Images copyright and courtesy Chris Randall
Text copyright Michael J. Fuller

Looking rear into the tunnels.  Note the lack of any suspension elements lying in the tunnel section.
The vortex generating strakes improve underbody efficiency by energizing the underbody airflow.
Close up of the strake showing the proximity of the exhaust inlet into the underbody.
From the top you can see how the exhaust is routed into the tunnel.

©Copyright 2003, Michael J. Fuller