I run an LSR 2-1 (1 3/4" primaries) on 97" 2002 Road. Friends and I have compared my LSR to their Propipe, Thunderheader, Fat Cat, in our opinion we believe it's not louder than those pipes. Before the LSR I ran a WB E-Series 2-1. With the LSR over the WB, The TQ / HP increased and street acceleration is quicker, seems to breathe freer, especially with my Baisley reworked heads.
There are a few versions of the LSR all with different sound levels.
LSR 2-1 Pro Stock Spyder
LSR 2-1 Black Hole
LSR 2-1 Pro Stock (no baffles)