Clicking Sound After Driving a While

#1
I hear this strange clicking sound, but I don't see any loss in power or fuel economy. When I first start up the car, I can smell the exhaust heavily, but after driving for a while and then stopping, no smell. I think its a small exhaust leak, but shouldn't I be able to smell it after driving around for a bit??
No CEL on either.
Is this clicking sound normal or should I be worried?
Its been like this for about a month now.

2005 Toyota Corolla S
133,335 miles
no accident/damage

EDIT:
replaced serpentine belt 3 months ago and checked tensioner. It was fine.
 
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