mew and I own from the MR762SD package (seemed uber cool and COLLECTIBLE at the time....) is the GEN 4. (which according to mew and his conversations with O.S.S. themselves....is really the Generation ONE (1) just cleverly marketed) and between the BPR Back Pressure Regulator and SRM Sound Reduction Module are exceedingly difficult to "index" AND make the Octagonal outer shells align WHILE making the inners TIGHT. I am positively FASCINATED by the photos of your Instructions with not only directions for an additional 45* TURN to torque the innards, but an included TOOL TO DO SO!!!!! They (O.S.S.) SAID in their literature at the time, that would be a tool constructed or included at the time of manufacture and printing of Owners Manual, but they in fact never DID create one for our version/generation.