Hey, I recently had my Diesel Particulate Filter taken out. Now my truck makes a really loud noise when accelerating. It's at its loudest at around 40 to 50 mph. As soon as I let go of the gas pedal, it stops. EGR delete kit is on its way. My exhaust manifold gaskets are leaking. Is one of these things causing the noise or could it be something else? It was ok, until I started pulling a really heavy fifth wheel. That's when it got really loud and it stayed at that noise level, even when I dropped the trailer off. Or could it be a U-joint?

My truck is an 6.7 08 Ram 3500 Dually. Has about 524,000 miles on it.