ORIGINAL: Believe It
btw curious what pipe and muffler are you using on the 60 nitro boat? I have a mac nitro pipe and prather muffler and it would probably never make it under 92db with my OPS 65.
I've got Andy Brown parabolic pipes on two of my .45 boats and my Sprintcat that's got an OS .81 that also has a parabolic from Andy. No problem being under 92 db on any of them. My Roadrunner will get a CMB .81 with a Macs nitro pipe with an add-on muffler, not sure whose yet. These have also been shown to be below 92 db. For a while I ran a gas mono with a pipe from Mastons that also had no trouble being under 92 db.