Followed instruction from http://www.miata.net/garage/ very helpful just want to add somthing. The drain line were full of dirt. pulled them out of the bottom and cleaned out. Cleaned and replaced by running wire from the top through the hose then pulled them back up after putting a little light glue on the end it slid right on. Be careful the drain area will crack. Took about the amout of time 6 hrs, took my time next time it will go quicker and better, hopfully in about 5 years or so.