Finally fixed my adj waist gate actuator today and I was taking the car out for a spin to see where the boost was. As soon as I got in the throttle the car shoots to 20psi and the I hear a loud pop! The rpm's drop from 4k to 1k almost instantly and the car continues running farily well. As soon as i pull over I realized that I didn't put the vac line on the actuator when I put it back in. I was only about 3 blocks from the house so I limped it home. The car ran fine but had a terrible hesitation. I was watching the temp and oil pressure the whole way and everything was fine. After I got home I discovered the the up pipe had blown off. I got everything hooked back up and the car seem to run well. Coolant level is normal as is the oil. Did the up-pipe blowing off prevent any damage to the motor? The engine has 144k on it and has never been opened. I will be replacing the vavle springs and timing chain next weekend. Should I go again and do the headgaskets?