That's a little much on your stock electrical the audiopipe isn't the most efficient either.
Unless you're running a lot of power I'd use the stock speaker wire on the drivers side to get you through the garment. It's probably 16 guage 100 watts or less should be fine.
Good that you're going to build an enclosure. Anyone that has a passion for car audio and is capable of building a simple style type enclosure should tackle it imo. It'll give ya a better understanding of how important the enclosure is to the subs performance and how the sub works with different air space port size and power.
Learning how to use a design software program would be beneficial as well. Personally I use bass box pro but Winisd is free and good enough for someone starting out.
Torres box calculator and ultimate car audio app might be helpful too.