Quote:
Originally Posted by Cobra #3170
Current mufflers are Stainless Specialties ,straight through large ID about 2.75 but am not sure.
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Straight-throughs are always going to be somewhere between WOW! and TOO DAMN LOUD, I SAID, TOO DAMN LOUD!
They'll kill all the really irritating high-frequency noise but not much else.
You need at least some baffling or foldback to hold in the lower-freq engine noise. As noted, a little backpressure is a good thing.
You might be able to have a good muffler shop insert new cores in your existing pipes for a lot less than a full replacement of the muffler sections. A simple glass-packed single fold/baffle will reduce even that monster mill's noise to something well into WOW range.
You will likely need to retune the carb after the change. The backpressure will change airflow a bit.