This is what happens with a Bad Tune and Too Much Boost-
"Magnum
Powers SC installed on 2004 TJ, around 12lbs of boost with just an
intercooler. The tune was not quite right and was having some pinging.
The first thing to go was my head gasket and after replacing that, the pistons, 3 of 6 went bad."
Other Jeep Cherokee OOPS. Not supercharged related. ?Leaky injectors?