2001 Cadillac Northstar LMP01

Images copyright and courtesy Patrick Michl and Michael J. Fuller
Text copyright Michael J. Fuller

Nigel Stroud was involved in the Reynard 2KQ revisions before the Cadillac.  There are a number of details that are similar to both.  The tail extensions worked on the 2KQ to increase rear downforce.  Presumably they do the same on the Cadillac.
Note the low wing architecture on both cars:
2KQ:
Cadillac LMP01:
The front wheel well area air management is also similar:
2KQ:
Cadillac LMP01:

ęCopyright 2002, Michael J. Fuller