ok im going from my stock ct 26 to one with a 57 trim the question is should i go ahead and do the head gasket fix first? what would be the best thickness? im only going for 350-375whp at the most. I also need to know what needs to be done to the ecu, as far as A/F mixture or whatever should be addressed when changing to an upgraded turbo? Im knew to the game obviously, but would like to learn as much as possible. That is why im asking the experts Any advice will be appreciated.