Hey Jayrome.
Its nice to get a accurate break downs of the companies and the differences.
So JASMA standards are slightly different to standards in Vic.
JASMA noise pollution is 93db whereas in Vic we are 90db.
So this is proving a problem since very difficult to get an idea of how loud the exhausts are since not many people have them.
And the people who do have them, are running them on track cars, or simply don't care about noise pollution.
I live in the Eastern Suburbs of melbourne.
And especially around the knox area, po po enjoy pulling over cars that are noisy or to low..
Another company i've heard great things about are Remus.
And although they boast about meeting EPA regulations, you don't get much details on flow.
I guess like Magna Flow you purchase the muffler, resonator and cats separately and get a exhaust shop to fit the pipping.
I've also heard remus are very very expensive...
Remus are good, but from what i saw in 2004ish (a cut out at BMW show room), they have versions of there mufflers with fiberglass packing and stainless packing, and they dont tell you which one you get... flow wise there like every other "stock upgrad/replacement" exhaust system they have to follow ADR and Emissions so they will have some sort of restriction. also notice that Remus never put massive tips on there exhausts, when they do the out side it big, but the internal diam is still matched to the piping...
yes JASMA is slightly different from us but its a start, even with a 93 DB from a new exhaust, you can always add a hot dogs or a another muffler to it (if you have the space) to make it even less loud.... also most JASMA plated exhausts are not tru 3", they are 2.75" to keep the noise levels down...
just a rule of thumb, people say the exhaust tips wont make a diff.... they do just not noticeable by our ears .... from experience a 5" tip vs a 3" stright pipe, the 3" can be that 3 DB quieter on the road side test etc. also the longer the exhaust tip the better (pending space), it changes the exhaust note from deep to higher pitch, also lessens drone (not always, but it can)
material choice is also another factor, Stainless VS Mild steel. Stainless would be around the 304 grade 1.6MM wall VS Mild steel ERW 1.6MM. stainless is lighter, but it tends to leak out some of the sounds through its walls and can sound "tinny", mild is heavier but it is very good for holding the exhaust note till the end of the exhaust. (i suggest seeing for your self, ask someone with a stainless exhaust to rev it, and compare it to someone with a mild steel exhaust)
if your in the south east..... try Performance Exhaust Ringwood, and speak to David.. they have Magna flow stuff on shelf, and have displays of them. Have a look at the displays and you will see what i mean about the rear mufflers having restrictions etc....
are you planning a turbo back exhaust or just cat back?
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