Exhaust leak?

[Rick33]

I just brought my new 08 CC f250 home and noticed while driving that there is swoosh sound when I give it fuel. It goes away after the truck reaches a certain rpm level, but from take off it's kinda annoying. The sound seems like it is coming from where the cat is. I crawled under it when i got home but all the hangers seemed secure. The truck does have a dfp delete and aftermarket intake on it. Is that a normal sound for a modified truck?

Thanks

[firefighter317]

not real sure about the aftermarket part but id check and make sure all the intercooler pipes are secured and tight. what about the coolant overflow tank? is there white residue on it? usually if you have a cooling system problem and there is residue, it will make that kind of noise from forcing coolant gases out of the tank around the cap.