I used a peice of 1-1/2" pvc coming out of air box with 2- 24" peices of 2" flexible radiator hose up and over the carb and next to the head out the left side of the bike. That runs all the way to under the rack just in front of that storage box. From there i used an 1-1/2 45 degree fitting to angle up through a hole that I cut. Then I put a 1-12 to 2" reducer to upsize the stack coming up to a 2" pipe. I had to play with jets a lil but I like it because it is a straight shot to the air box. I now have my filter at the top of the stack, I run a 175 jet with ported head and hmf exhaust. It is a bad ass bike after the port job.