I have a 292 and installed Brockman mellow tones, they were too loud, I put the old Smitties back on, but the have pinholes and also are a little too loud.  However they are quieter than the Brockmans, but they still tend to rap.  I want mufflers with a throaty exhaust note, I just don't want the rapping.  I am considering an Amazon Total Flow 31245.  It is a turbo muffler.  Has anyone used a product like this.