I am sheetrocking my garage this weekend, and will be installing 50k mr heater and insulation in a couple weeks. I want to get the gas line ran for the heater prior to installing the sheetrock. Here is my question, do I really need to cut the extra 1/2" CSST? I have about 55 ft to run and really don't want to use the old school metal pipe. 75ft is what I am planning to go with, but curious if I really need to cut the extra length.