Not a mod, however, I neglected to think about the heater being like a freakin blow dryer on high. So I clipped an air freshener to the vent in the center right, after a couple days just as I noticed a hardened puddle of goop on the base of the gear shift I stopped and leaned over to inspect about the time the freshener commited suicide... My head and the passenger seat got sprayed... Lesson learned

 

I use the little trees i put it in the vent when i use the ac or else i hang them on my head rests

 

This was one of those glade gel things