10-21-2007, 02:22 AM
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CC Member
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Join Date: Aug 2001
Location: Melbourne, Australia,
Vic
Cobra Make, Engine: G-Force Mk I, 5L Windsor, TKO 600, enhanced Jag / Koni suspension & LSD Diff.
Posts: 2,298
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Not Ranked
how low??....small do you have to go?
Have taken several noise measurements of the exhaust in advance of meeting the engineer.
Car generally has a two inch system with AU cats and 14 sports mufflers only, and is hitting around 93.5 dBA at rpms required. Tried first inserting steel restrictors at the flanges at the back of the cats with a 40mm hole and then again with a 28mm hole.
Second effort has gotten noise to 92.5 dBA.
What do I have to do to get under 90 dB?
Am thinking I return to exhaust shop for a pair of flanged hot dogs plus a pair of straight flanged pipes, the hot dogs for engineering and the straights for after.
Is there likely to be a cheaper way for me to meet the limit?
Cheers
__________________
slowy
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