Are Loudmouth Resonators Legal In Oregon

I hope this is ok that I posted this question here, I couldn't really find a good spot to post it.

I would like to replace my stock mufflers on my 2000 mustang gt with these http://www.americanmuscle.com/slp-loudmouth-shotgun-resonators.html but before I cut my pipes and weld them on I want to make sure they are legal in Oregon. I haven't been able to find any information online, so I am hoping one of you knows. I know Oregon requires all cars to have muffles, are these considered mufflers?

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Does anyone know how loud the lm1 resonators are with stock everything else? The only videos on youtube that I can find are lm1's with after market h pipes or full lm1 catbacks and they seem way to loud.

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