I baught an SC kit which comes with the plastic discharge tube. I later upgraded the head unit to an V-2 SQ S trim. I have an 8 rib set up with 2.95 blower and 7 inch crank pulley. I don't see more than 9 lbs boost and wonder if boost may be leaking by because of the plastic pipe and lack of good clamping force. Anyone have an idea.