To answer your questions,I run a oem set up as far as heat/ac.
The covers do not leak.(When installed properly).they were rock solid for me.The only reason i' m selling them is i
wanted to use the stock covers. So i bought some spacers and did
just that,and i dont plan on useing them again. I used k&n
breathers. These covers are in perfect condition. Just need a
new home. thanks and let me know if you can use them.