IME&O the increased noise level often associated with fitment of a Pitts style muffler would generally be frowned upon by your typical pattern flyer. The at times noticably increased noise level, is exacerbated when fitted on larger capacity engines. Beauty is in the 'eye', or in ths case ear of the beholder. Unlike Ken, I don't think of the increased NOISE from the lower volume Pitts style mufflers as 'sooooo...cool", and it becomes a major irrititant when it's obviously deafeningly loud to all but the owner blinded in his enthusiasm and attachment who refuses to acknowledge what others are complaining about - because to his ears it simply sounds "more realistic".