I have oem head gasket right now on the civic with 330 whp and 260tq with e85 with 15psi.I was racing one if my friend from start and rolling. While when i was racing him my check engine light pop on and the air heat is not hot no more it is cool and warm so I pull over and take a look at it and my coolant little bottle is pop off and coolant everywhere. So i wait for a few minutes and turn it back on and drove it on the high way normally without beating on it and the check engine is not on but when I beat on it the check engine light is on. Also its funny. every time i drive my turbo civic my coolant little bottle always fill up to the top so I drain some out to normal level and drive it again and it fill right back up. So I don't know what is going on. Let me know what you guys think. Thanks allot!