There is a downside to the Porsche on the highway, though. It’s loud. The flat-four is more vocal than the Audi’s five under all conditions, but at highway speeds, it turns 1000 rpm or so higher. Geared tall on the low end—redline arrives at 47 mph in first and 80 in second—and short on the high, it’s as though the Cayman has six third and fourth gears. And there’s enough road noise to make you think that at least 174 of the Audi’s 175 extra pounds are sound deadening. Porsche can’t blame it on tires, as both cars rode on Pirelli P Zeros. It doesn’t help matters that the Audi’s Bang & Olufsen is an outstanding stereo, and the Cayman’s base system sounds not entirely unlike an iPhone in a Solo cup. We also find it a little bit insulting that you can spend $80K on a Porsche and still not have automatic climate control. That’s embarrassing, not so much for owners as it is for Porsche.
Source : https://www.caranddriver.com/comparisons/audi-tt-rs-vs-porsche-718-cayman-s-comparison-tests-2017-porsche-718-cayman-s-page-3