[Shane@DBPerformance]

He doesn't know much about his motor, he bought the car modded. He is running running over 30psi of boost. He isn't knocking.

Pushing coolant under high boost, high load, higher power is common with the DSM heads even with no knock/detonation. They are not as rigid as the Evo heads and are prone to flexing easier. L19/H11 head studs and good headgasket usually fixes this and sometimes even when you just slap them in like Brad did. The Mistu MLS gasket for DSM is not all that good, the Evo MLS is very good. I personally think that normal ARP head studs might be worse than stock head bolts, but I could be wrong. If they are better, they don't seem to help much at all.

When the head lifts on a DSM under high load, you push coolant and it goes back down and all is fine until you boost again and push more coolant, or you push enough to get a big air pocket and start overheating, or you warp your exhaust valve seats from doing it too much. You don't want to fill up your coolant overflow and have it overflow onto your tires though at 100mph. When your head lifts on an Evo it likes to blow freeze plugs out of your waterpump or block, makes a big mess.