What he said! Also perhaps offer it in white color as well. I'd take a Model S and CyberTruck version. And to echo comments by some other folks, please make it a high quality T-shirt that doesn't decompose after the first wash.back is good to go.
sleeve: remove car (your best visual design, does not belong on the sleeve)
front: remove vertical text. (distracting)..
remove "member" (awkward label which will cause loss of sales)..
move car design to front pocket area, shift TMC logo downward to make room, and make it smaller (about 60% of original) so that it doesn't overwhelm the car design.
maybe put "teslamotorsclub.com" or "tesla motors club" on sleeve.