I tried the method for coolant change w/o removing the tank and it was remarkably easy. I got a one quart funnell with a couple feet of hose attached....added more hose, zip tied the funnell to a ladder for height and gravity fed in the coolant. The additional clear plastic hose was very flexible and easily worked into the filler hole on the radiator. I thought getting the cap back back on in the somewhat cramped space would be difficult, but it wasn't hard at all. I did remove the front spoiler which made the draining process easier...just a few minutes to do that saved a lot of hassle and probably some mess. Thanks to those who posted those instructions!