The 3 inch single oval tip we have available is quieter than are 2.5" dual tip. We also have really HUGE 3 inch resonators to go in the test pipes that really make it quiet. The 3 inch has no rasp with the parts we use and sounds very clean and deep.
We have been rolling with a backorder of about 20 sets since we first started letting then out in December/January
Currently, before this post I was 8 sets behind on the downpipe orders.