I found this funny video with Ironman and Mario Andretti. Take a look for yourself:
IRONMAN Magnaflow Commercial
The MagnaFlow website keeps changing their video player so the link now works. Also they did a "behind the scenes" video of the making of one of their commercials. It shows a tiny bit of off-road action but still, not enough Iron Man Stewert:
Ironman, Boyde, Mario commercial production.
CHeck it.
Also here is the link to the Magna Flow videos page. They have all sorts of video of commercials and tv shows featuring their products -
MagnaFlow Video Page