i got an arc kit on my r32 gtst......cost me ~$1400 from nengun.....landed with taxes.
I wanted a kit i was going to have absolutely no dramas installing and that what i got, didnt have to cut my front bar, didnt have to cut holes in the engine bay, and didnt need anything else other than a 10, 12, 14mm socket and a screw driver to do the whole job. Basically, everything was perfect.
at the track days with 15 mins of constant high loads the hot side becomes too hot to touch and the cold side is still cool enough to grab.
2 thumbs up for me.