The interior size difference really isn't that much. The 911's barely a 4 seater. I'd bet the difference between the volume of the back seat in the 911 and the boxster's rear trunk+area on top of the engine is pretty small. My dad and I did 1400 miles from Arizona to Louisiana and never had any claustrophobia issues. We're both decent sized guys, and we had the top up the second half to minimize our skin cancer. I think my dogs get claustrophobic after about 8 hours of traveling.
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