Whats Quieter?

Anybody on here familar with dynomax ultraflo's?I'm trying to decide between the oval or rounds.Im not sure which ones are quieter.I know both will be loud in 3 inch,but im thinking maybe the ovals wouldnt be quite as loud?Their going to be ran all the way out to the bumper with an x pipe to try and help.The cars going in this Saturday so im searching for the answer.Also was thinking flowmaster even though everyone has them.
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