GET IT FIXED!!!! i had a double whammy last week, not only was that cracked and leaking coolant into the engine, but then my Head Gasket Blew and it was NASTY. Get it fixed now before it turns into a 1700 job like mine did, yeah 1000 of it was labor but it blows ass get it fixed now.

Edit: The Plenum was 205, then the gaskets, in my case i needed the heads cleaned up as well and head gaskets, new plugs oil, coolant, do it now bro before you end up with a disaster.