Most exhaust shops work on modern vehicles... they wont know what is quiet on a 500hp stroker engine. Guys on a forum that own or build these engines will have more experience than the average shop these days.
Also, "quiet" is very subjective, one persons quiet can be another persons loud. is it drone at a cruise RPM or the sound at idle that you dont like?
If you already have turbo mufflers and dont like them, its doubtful going to another brand of turbo mufflers will be any different. But they do make a longer case turbo muffler thats supposed to be quieter than the short ones.
Most straight through mufflers will be louder than a turbo muffler just by design, if a turbo is too loud a straight through will most likely be louder.
A muffler has a hard time making a 500hp engine with headers and big pipes be truly quiet and free flowing usually is louder than more restrictive quiet mufflers, so its gonna be a trade off for sound vs flow.
If you do have headers, the biggest sound reduction will be using manifolds, even the high flow RPM manifolds are quieter than headers. Also I found that an X pipe in the system will help to quiet the exhaust while providing better performance.
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