I dunno... When my water heater went out I jumped out of that shower in a hurry. Imagine an angry homeowner butt @$$ naked in the attic making sure my house didn't flood out.
I can confirm that a 2.0L Ecotec does fit in a Comanche and can direct mount to an AX-15 with a solstice bell housing... You know just another option...
My knees and my back and I am 26 and of average weight for my height...
With that being said... you should get a foam roller for rolling out the center of your back. If I do that regularly I seem to have less issues with that part of my back.