One of the great things about the Nissan GT-R finally being available in the USA is the abundance of solid tuning experience available country wide. It’s safe to say that today, US tuners are all over the GT-R.

Road & Track Magazine have recently gotten to spend some quality time on the first proper performance test of the new Hennessey GTR600. They’ve performed a number of performance tests and managed to gather a good set of data points.

Along with that they’ve published up a full rundown of what exactly comes with the GTR600 kit and at what cost.

Recommend you check it out at the link below, some of these numbers are going to surprise a few people!

Photo: Guy Spangenberg for Road & Track Magazine
Link: Road & Track Magazine: 2009 Hennessey GTR600