hey buddy......need to ask a quick question.......or as far as that goes , any of you motor guru's out there. I'm installing my BME 115 up with the DA 100 header's and MTW 75 cans ( front exhaust down tubes). I cut the lengths to 7" on one side and 7-1/2" on the other side because of the jug offset on the motor. what is the distance i'm looking for inside the teflon coupler between the cannister and header? The gap between the two needs to be about how long? Thanks man!!