Jose,
These are Stainless Works 24" smooth rounds, and the pipes are custom mandrel bent by them. If you are talking about one of their replacement systems with original style off-road mufflers (round ones), then they are entirely different mufflers. They are quieter than these mufflers, but not as quiet as the original style ovals. I do not think that you will find the original style round mufflers too loud.
Regards, John McGraw
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