What are the signs/symptoms to be aware of if engine mount may need to be replaced?

Not really sure what it is but when I accellerate from 0 to about 25 and when I slow down from about 25 to 0, I here this "chirping" noise the speed of which is proportional to the speed of car - faster as I go fast, slower as I go slow... Best description is "chirping" but can also be described as "bubbling" or I was thinking, fan hitting shroud...?? propeller shaft rubbing on something?? not loud...

Recent work, New Exhaust from manifold to rear, replaced air cleaner bracket and new support studs with heat shields...

Sound seems to be coming from right side of engine compartment...

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2007 Honda Accord EX
2007 Honda Accord SE V6
96 C220
97 Explorer - Found Another Home
2000 Honda Accord V6 - Found Another Home
85 300D - Found Another Home
84 300D - Found Another Home
80 300TD - Found Another Home
Previous cars:
96 Caravan
87 Camry
84 Cressida
82 Vanagon
80 Fiesta
78 Nova
Ford Cortina
Opel Kadet
68 Kombi
Contessa