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A Tmax of 180C is pretty useless for power generation. Sure you could use like 50-100 of them on your exhaust, but weight and cooling become a problem.
Commercially available ~300C peltiers that size are 100 dollars for about 15-20W capacity running at max delta T. If you're using the car's existing coolant loop at 90C even with an "intercooler", you'd be lucky to get more than 10W from each one.
In addition if you're running them at max temp, the ones I've seen put out 15V or so which is too high. If you wire that straight to the battery you'll end up bleeding off a few percent of the precious power through internal resistance.
Ideally we have the turbine for pressure recovery, and then the TEGs for heat recovery working together. On a hybrid car of course.
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