go to skunk2's web site. they even list on there for 280. that's for the B16 and teg R. granted it's 345 for the gsr, but you can use the type R on the GSR just fine. and for the throttle cable. it's kinda hard to explain, but what you do is, you have to loop it around from the left side, and come up underneath. that's with the stock gsr IM.
but if you put the Skunk2 on. thenit's even easier. all you need is the bracket thats attatched to the driver side strut tower...connect the cable to the throttle body, and pull it tight, and snap it in that clip. i did it with my del sol with a b16. it worked just fine, even after takin it to the track.

-Robbie