Post
by P_G » Wed Jul 28, 2010 3:02 pm
The resonators do come in separate sections and IIRC Milltek used to swap them FOC for non res section if you bought from them direct and you didn't like one of t'other.
Res valved valves closed would be like OEM sport and valves open a bit louder (OEM sport with windows open) but same effect as an H or X pipe.
Non res valved is probably best. Example. I had a non res cat back put on my S4 which didn't have the option of valves which was good but changing to race cats and downpipes increased the noise and drone by over double I would say.
Plus with non res valved in town you close the valves to silence whatever resonance drone you would get and still have civilised driving.