Test Drive: 2016 Porsche 911 Targa 4 GTS (04:35)

Graeme Fletcher says he can't think of a nameplate with more derivatives than the Porsche 911.

For those keeping score at home, it's at 25 and counting.

The latest is the 911 Targa 4 GTS, a two-in-one sports car that can be had in coupe or topless forms in 20 seconds flat.

And speaking of flat, the GTS' flat-six makes 430 horsepower and 325 lb.-ft. of torque, helping the car sprint from 0 to 100 km/h in about 4.5 seconds.

(This segment originally appeared on Episode 3 of Motoring 2016.)