My radio broke so, I have been driving around with no radio. I am hearing a rattle when i lay into the throttle 1/2 way. This is my 1st diesel so its all new to me. Is this injector rattle or valves ? Is this normal or bad?

The truck is all stock except a mrbm dual catback exhaust. 44,000 miles

 

I hear it on mine also but it goes away at full throttle, i think its the ecm playing with the timing.