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Chuffing sound from my 300...?

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What do you guys think would be causing a chuffing sound to be coming from my 300, while under load? It sounds like an exhaust manifold gasket has let go but no black marks show, nor do I feel anything blowing out there. She's a '96 with 640,000 miles and has never been apart. Is a compression test and maybe a valve job in my immediate future?

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Broken clamp... I'll check that in the am. The sound is like a single cylinder blowing it's compression out somewhere and it sounds perfectly normal when you just rev it up when stopped. Under load she sounds like crap.

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Problem solved. I had a buddy do a cold start while I stood at the engine. She puffed smoke out of the rear of the exhaust manifold for a few seconds and I could feel the hot exhaust with my hand. Now the fun begins!

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