Quote:
Originally Posted by Moto One
(b) A certificate of compliance for a vehicular exhaust system shall be issued pursuant to subdivision (a) if the vehicle complies with Sections 27150 and 27151. Exhaust systems installed on motor vehicles, other than motorcycles, with a manufacturer’s gross vehicle weight rating of less than 6,000 pounds comply with Sections 27150 and 27151 if they emit no more than 95 dbA when tested in accordance with Society of Automotive Engineers Standard J1169 May 1998.
(b) For the purposes of exhaust systems installed on motor vehicles with a manufacturer’s gross vehicle weight rating of less than 6,000 pounds, other than motorcycles, a sound level of 95 dbA or less, when tested in accordance with Society of Automotive Engineers Standard J1169 May 1998, complies with this section. Motor vehicle exhaust systems or parts thereof include, but are not limited to, nonoriginal exhaust equipment.
(Amended by Stats. 2001, Ch. 92, Sec. 10. Effective January 1, 2002.)
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The referenced test appears to be obsolete and superseded by J1492, but here's what J1169 says: "SAE J1169 is a legacy test that specifies ¾ maximum rated engine speed (MRES) as the test condition."
https://www.sae.org/standards/content/j1169_199805/
That would lead me to believe an engine with a 6,000 RPM redline would be tested at 4,500 RPM. There is nothing in the summary document I saw which showed testing distance (obviously a critical factor in SPL measurement), but presumably the SAE standard document(s) would dictate that. I'm not willing to spend $81 to download the document.