BlueTang

Has anyone ever done, or do you know somebody, who has tested exhaust systems?
What dB levels are recorded? How was the tests conducted?
I am trying to find a dB level that is illegal or is the industry standard.
Thanks.

No More B5 S4

...I only tried to make them louder and louder and deeper and deeper sounding. The loudest a dual 2.25" straight pipe set-up that was as loud as a loud Harley.

That's about all I can help you with. :-P

BlueTang

Any technical data?

No More B5 S4

...loud exhaust systems attract 1 out of every 2 police officers in Boston, MA and 98 out of every 100 police officers in SoCal.

Data from other states pending. :-P

Ram@S4-MTM

<b>Exhaust Noise Testing</b>

Most exhaust noise tests specifications are generally based upon the "SAE J1169 Measurement of Light Vehicle Exhaust Sound Level under Stationary Conditions"

For example, California and various other states in the US mandate J1169 SAE stationary noise tests.

The upper value limit is 95dB

The test involves positioning a type 1, SIA compliant ANSI S1.4 - 1983 noise level meter, specifically as illustrated in the diagram below. No other positioning is relevant and the noise tests are extremely specific in their scope and must be conducted in accordance with the specification.

Engine RPM must be held steady at 75% of rated peak horsepower RPM and sound levels logged at that rpm.

Example: if your vehicle makes max power at 6,000 rpm then 6,000 x 0.75 = 4,500 is RPM tests are taken at.
<img src="http://pictureposter.audiworld.com/24420/1169.jpg">
<b>Diagram taken from SAEJ1169 Testing Procedures</b>

Hope that helps!

mtmOla'

can you get a hold of piggie also, trying to get some dp's and he's not responding

No More B5 S4

Yes, I've run 3 different MagnaFlows. They are AWEsome sounding.

mtmOla'

coool my next mod will be AWEsome then