Manifold installation

So the manifold is back on and the exhaust system is back in place. The car starts and runs great. The disappointing part is this did not cure the noise I have been hearing. When I get to 20-25 mph, I hear a "ftt ftt" or slight squeaking noise. It is quite regluar. Doesn't seem to be related to road condition, although it is hard to tell. Almost sounds like it is coming from left rear. It won't stop me from driving it but I sure would like to find the cause. Any ideas? Thanks for all the help. Howie.
 
Manifold is back on. Exhaust pipe/muffler is back on. Car starts easily and runs really well. Once warmed up and at 20-25mph, spitting noise occurs quite regularly. If there is a loose baffle in the muffler, is there any way to tell short of cutting the muffler open? Thanks. Howie
 
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