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New type exhaust
madteg - 15/12/09 at 08:21 PM

Have a look at ( moroso spiral flow mufflers ) i think this is a good idea instead of wadding, what do you think. Sorry don't know how to do the linky thing

prelude1980 - 15/12/09 at 08:26 PM

Linky

here you go

blakep82 - 15/12/09 at 09:43 PM

interesting. any ideas on cost?

Chippy - 15/12/09 at 11:18 PM

I always find if people don't put prices on there web sites, then I can't afford the parts. Cheers Ray

dlatch - 15/12/09 at 11:21 PM

5 - 7 db drop over open collectors

don't sound like they silence much to me

Breaker - 15/12/09 at 11:31 PM

quote:
Originally posted by dlatch
5 - 7 db drop over open collectors

don't sound like they silence much to me


Don't forget dB is a logarithmic scale.
A 3 dB drop means 50% of the original "noise"

MikeR - 16/12/09 at 08:47 AM

also remember a lot of people have cars fail track side noise at 99 to 101db. Open headers ..... got to be way more than 106db.

MikeRJ - 16/12/09 at 09:49 AM

quote:
Originally posted by Breaker
quote:
Originally posted by dlatch
5 - 7 db drop over open collectors

don't sound like they silence much to me


Don't forget dB is a logarithmic scale.
A 3 dB drop means 50% of the original "noise"


This is a common mistake, -3dB would be half a power level (e.g. electrical, optical etc.), but sound level takes into account the ears response. In this case a 10dB drop is half the perceived sound level (though it's quite approximate and varies with frequency and sound pressure).

buncefm - 16/12/09 at 05:49 PM

anyone know of these being used yet or has anyone heard them?

brianthemagical - 16/12/09 at 06:41 PM

Seems like a poor idea to me. I assume they work by restricting the air folow, thus removing some of its energ and noise.
I'm guessing you can see the difference between the restriction this woud offer and that of a straight through silencer.