one of us is on radiator #5 in his HC, 3x OEM [current] and 2x Mishimoto [3 if I include the Mishi UPS destroyed in shipping]. Two were popped by idjits who insisted on pressure testing a cold system, over and over and over and over til a seam started to leak, rather than just starting the car and bringing it up to temp and looking [heater core on both occaissions, not like I didn't id it for them at the start, and show them the lake that formed under the gas pedal].