I have a 94wrx and am having a problem with the front drivers side coil pack spliting around the middle.
I have replaced all four coil packs, all plugs, replaced the ignition amplifier and had the ecu given a clean bill of health(gems).
What would cause this to keep overheating and splitting?Im really getting to the end of my teather now!!

Nathan

 

That would be one of the hottest places in the engine bay is your up pipe heat wrapped ?