Just got my new shirts in the mail yesterday. Found this cool website, Bavaria Classics. They sell a huge variety of German car parts but they also sell tshirts as well. Being the BMW enthusiast that I am, they had a couple designs that I just had to buy.
This one seemed appropriate as both my 335xi and E34 M5 are powered by BMW straight sixes.
Also, as an E34 M5 owner, I had to get this one:
The resemblance is uncanny :)
If you like any of these, they have a whole bunch more on their website, http://bavariaclassics.com/
The cool thing is that if you have an idea for a design or image, you can submit it to them and they’ll put it on a shirt for you. They have a bunch of Porsche/BMW/Audi/VW stuff on their site now.