Quote:
Originally Posted by Modena
my sidepipe design is using a perforated inner 2.5" tube which is wrapped in stainless scourers, but the next step for me to TRY to quiet them down for rego is to add the auger that you describe, hopefully it will make enough difference.
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I have a pair of 3.5" Patriot auger inserts (
http://www.summitracing.com/int/part...3843/overview/) in each of my side pipes, and they're surprisingly quiet - actually too quiet for my taste. There's far more wind noise than exhaust noise at 110 km/hr steady state cruise. They get a bit louder under acceleration, but nowhere near the sound levels I hear from many other vehicles.