Need help on parts for the 2006 season.

[A//// Guy]

I modified a polished aluminum oil catch can to make it work as a coolant catch can. I got it on ebay for like 60 bucks...

You cant have a totally sealed overflow because then it will never be able to "overflow" if you overheat, etc.... Thats the point of having a overflow tank, so I dont see how they can make you have a sealed one when you will need to equalize the pressure like Steve said.