I've lost track of whether or not the Delkevic exhausts are going to be used with a full system or stock system. On a STOCK exhaust, the SS70s will not be much louder than stock. I'm a tourer and loud pipes are irritating to me and the SS70s are not irritating. In fact, I ran them without the baffles.
With the stock exhaust system, cat and collector in place, pretty much any exhaust will be fine. On a full system, you'll probably need a bit more sound deadening to be ear/neighbor friendly.
BTW, I'm still impressed a couple years after getting the Delkevics. Fit and finish were excellent, no rust or scratches (good stainless used) and, of course, great price. They just sat there looking and sounding good.