I've just installed RB Res and muff. I must say, it is relatively quiet, more than I was expecting. Probably around 70% more quiet than the straight pipe.

I'm posting this because I searched all last week for a comparison and couldn't find one. Also I am very satisfied with the noise reduction, especially for a single outlet.

 

Interesting. Can you post a video for the sound?

 

Yeah i will when i get a chance. I'd say its close to OEM, if not a little bit louder. Not exaggerating.

 

Are you turbo or na?

 

Turbo