By Nicholas McClelland From the couch, there’s nothing particularly mind-blowing about the Porsche 911 Carrera 4 GTS. That’s because on paper, or in the website configurator, the sports car sits in the middle of a rather staggering number of 911 variants — there are currently more than 20. It’s not the fastest, the loudest or most track-focused of the bunch, but as a daily driver the totality of joy it brings is vastly greater than the sum of its parts. A couple of minutes after the good folks at Porsche dropped the keys in my hand, I decided I’d take a quick lap around town. I thought I’d be …