Could any one tell me the big differences between this two mufflers, in terms of sound what's the less noisy.

Thanks

 

in my opinion the ovals are a little quiter. my neighbor had the ovals and i have the slip ons. side by side mine was louder. but the lucky devil went out and got rinehart true duels and i really like the sound of his now

 

Now I have the slash cuts and I think they are quiter then the ovals.. But it is hard to tell sometimes.. At an idle there is little difference between the two.