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Ben Lipman Goo Roo SA Soarer TT manual, plus TT track car
Posts: 3279 Reg: 04-2006
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Monday, August 20, 2012 - 07:35 pm, by: Ben Lipman(Ben12a)
G'day Daniel.
Mallala don't seem fussed with noise levels. Darwin had a rule, but never enforced it. Sydney tracks were more strict, being a 92 or 96Db limit. Qld is the same I believe. One of the track I visited (Wakefield or Darwin) had some policy about needing a muffler to prevent grass fires...
Most events I have entered state either 92 or 96Db measured at 30m, so I would aim to meet that standard.
I currently have custom dumps, 3 inch front pipe, 3 inch mid pipe into twin 2.5 inch pipes and Trust straight through mufflers. No cat. About as high flow as you'll get on a twin system.
I want to go 3 inch all the way through a single muffler. Mostly to save weight and increase noise. The car would easily pass emissions (noise) testing as a streeter, LOL. (this system plus a cat used to be on the road car).