Fair enough. The Supra is at least an entirely different car than the Z4. For a better example look at Ram’s trucks that you can order with a Cummins engine an

Fair enough. The Supra is at least an entirely different car than the Z4. For a better example look at Ram’s trucks that you can order with a Cummins engine and Allison transmission. Or look at commercial trucks where it is still very much the norm to have the chassis and driveline be completely different companies. Or look at Pagani who use engines from AMG and Xtrac transmissions for something closer to Tesla’s situation. Having a drivetrain sourced from outside the frame/body manufacturer isn’t common at all, but it is common enough that calling the Elise/Tesla a “kit car” or somehow unheard of is inaccurate.