VI: I think you have a different model camera then what the OP is posting about. If the OP really has the DR XT, which is model number 350D dating back to 2003, it doesn't support ISO 3200, and definitely does have noise at ISO 400 (see:
Canon EOS 350D / Digital Rebel XT Review: 19. Photographic tests: Digital Photography Review)
The XT does take very nice photos, but at iso 100, in this photo, it may be caused by his playing with the gamma and other exposure related settings in post. I'd say with how dark the photo is overall, after doing an adjustment to make it brighter, it would be normal to see some noise. A LOT less on a newer camera, but what you have isn't bad.
My biggest suggestion on the photo - as the focus of the image is the front end, the 2 things that draws my eyes away from the car more then they should: The beam behind the car is too bright (use layers in photoshop to reduce that area), and there are two lights on the left side of the photo that somewhat hover due to there being overhead lights that you can't see ceiling on - I'd do what I could to edit those out - ones eyes should want to stay fixed on the subject - it's easy for things like over exposure in a dark photo (the beam) or floating lights near the main subject to distract the viewer from what you want them to focus on...
Just some thoughts.