thats just two. You need to place the maf in a straight piece of pipe before the throttle body. I think the piece of pipe needs to be straight and around 18 inches long. Then you can vent to the atmosphere. I have heard they make more power but are harder to tune. good luck with everything.
Actually, the blow through set up is easier to tune. VMP Tuning makes a flange that you can attatch to a piece of tubing to mount the sensor. Then you don't have any transitions and you don't have to worry about trying to fit the entire MAF housing. The straighter the pipe the better.