does anybody have any information on how well these things work or dont work. I probably would do the end plate with a cobra heat exchanger but i dont think that would get over to good with the gm warranty. so i guess i will be limited to just the end plate.

 

I certainly wouldn't worry about a cobra HE voiding your warranty.

 

We discussed this a few days ago... I think everyone agrees that they are a good upgrade, and they won't void your warranty.
https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/will-cooling-mods-kill-warranty-75749/

 

pretty leary bout installing a H/E and then going back to the dealer with it.

 

^ It CAN void your warranty for your intercooler/aftercooler/pump. Or anything within the cooling system. As far as your sunroof stop working, it won't touch that part.