Good evening; I purchased my truck brand new in March of 2018.

2018 Crew Cab 6.7L Cummins.

In March/April of 2020, I did a full delete with DRD MM3, 30hp tune, full 5” exhaust with EGR delete.

The truck has been great; recently, I’ve been smelling coolant after shutting off the truck and walking by the front end, I couldn’t find anything leaking, and the coolant reservoir seems to stay level.

The truck has only 33k miles.

Today I got home from about a 40-mile drive, not towing anything, and wasn’t hard on the truck; again smelled coolant, so I popped the hood to look again.

The upper rad hose was hard as it usually is after driving for a while, I opened the coolant tank, and it immediately overflowed coolant out of the tank?

This is my first Cummins, so I’m looking for some input?

Is this a bad head gasket already?

Is it normal?