iirc correctly nicelys first s15 had one of these but i think it was imported with it on, im sure he'll be along shortly to shed som light :thumbs: it looks like a nice bit of kit though, the only real advatge for a low power engine i could see was ease of access to the plugs i wouldnt imagine much need for it though until running high boost/power, i could be and am likely to be wrong though :thumbs: