There is 2 6mm pipes and one 4mm so your calling the smallest 1 well it T's into the pipe from the inlet to fuel presure, 2 goes to intercooler pipe between intercooler and inlet, 3 goes to actuator..
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Here's a link to the manual, fairly easy to install.
http://www.hksusa.com/content/pdf3373.pdf
sound bobby never seen this till now
http://3.bp.blogspot.com/_0iDK9YjLEf...0/DSC00081.jpg
so the smallest one is on the right and we are calling smallest pipe number 1 so is the above info which u said right