California Vehicle Code Section 27151
27151. (a) No person shall modify the exhaust system of a motor
vehicle in a manner which will amplify or increase the noise emitted
by the motor of the vehicle so that the vehicle is not in compliance
with the provisions of Section 27150 or exceeds the noise limits
established for the type of vehicle in Article 2.5 (commencing with
Section 27200). No person shall operate a motor vehicle with an
exhaust system so modified.
(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.
In short this pretty much says that you can change your exhaust on any motor vehicle under 3 tons with an aftermarket exhaust as long as it does not exceed 95 decibels. There are exceptions that are stated in other codes, such as no "whistle-tips" which are tips that are added to make the pitch of the exhaust note higher. Also you cannot modify the catalytic converter in anyway. So remember guys, after the cat, under 95 dbA, then its all legal. Good luck and happy driving!
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