Early rough draft. I have a history of going overboard when it comes to initial drafts, and I take my critique to tone it down.
Excuse the poor Photoshopping, threw this together in a few minutes:
I also had an idea for one that says a bunch of stats on the front with the twins "$50,000, 600HP, 0-60 in 3 seconds" Then a trollface on the back saying "it's actually really slow". I'm sure that will be an even more niche shirt, but I'll draft something for it anyway.
Other thoughts from myself:
Probably an 86 badge somewhere, possibly more car color options/different badging, could be a concern.