[TerrysSPF]

As speed said earlier, it depends on when you'll be here. He mentioned the best car related items that are coming up, and Volo has also been mentioned. I'm sure the AMG dealer is gone from Glen Ellyn - if a company closes and property becomes available in the 'burbs, you can bet someone is going to build on it. Hummmmm.........too cold to go out to Rt.66 for any fun..........can't think of anything else "car related" unless you simply want to visit car dealerships (plenty of those!). Someone mentioned D&M in Glen Ellyn, but there is another D&M (not related) on Ogden Ave that usually has a nice crop of older auto's - mostly Vette's though.
While you're here, don't forget to visit a few quality restaurants. Some nice places have already been mentioned, but Sullivan's and Rose Buds are 2 of my personal favorites. If you're out in Bolingbrook head to Brandmour's for a 28oz Porterhouse (ask for Sheila). In Oak Brook, head to Magnum's or The Club House. St. Charles has the best burger / fries I've ever had at The Filling Station............I could go on, but I'm getting too hungry.