your going to get alot of difference in opinion here. Ive had experience with LRD, Paul Turner, Toomey, FMF, DG
and Id have to say the DG/FMF are probablly the quietest Ive used out of the box and had least amount of power gain also.
why do you want a quiet pipe and silencer? If your looking for it to be quieter repack your silencer.