20.15 Exhaust System. Every motor vehicle shall at all times be equipped with muffler in good working order and in constant operation.
Muffler defined: Muffler is a device consisting of a series of chambers or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and/or turbine wheels for the purpose of receiving exhaust gas from a diesel engine, both of which are effective in reducing noise.
The exhaust system includes the manifolds, gaskets, exhaust lines, mufflers, resonators, tailpiping, and supporting hardware.
Motor vehicles cannot be equipped with a muffler which is perforated or which was perforated and has been repaired, either by a muffler repair jacket or by patching or in any other way. In those cases where a muffler is perforated at the time of an inspection or has been perforated and has been repaired previous to the inspection, the muffler must be replaced or the vehicle rejected.
Some pickups are equipped with a camper or hard shell cover and are sometimes used for the transportation of passengers. The tailpipe should discharge the exhaust at the rear or sides. This truck modification will be considered as a passenger compartment.
The entire structure of a motor home-type vehicle is considered a passenger compartment. The cab only of all other truck-type vehicles is considered passenger or luggage compartment.
If the vehicle is equipped with lake pipes or similar devices, such pipes or devices must be securely plated and bolted or capped.
Dual exhaust systems may be modified to single exhaust systems and single exhaust systems to dual exhaust systems, provided the modification does not violate requirements concerning exhaust emission systems.
The catalytic converter will be considered as a part of the exhaust system on all vehicles prior to 1984 year model and will be inspected only visually (if present) for leakage. On 1984 and later model light truck and passenger vehicles, the catalytic converter will be checked for presence and leakage. Flexible tubing which meets the requirements listed below may be used anywhere in the exhaust system.
Then I assume you have MIL eliminators or De-Foulers. You can pass emissions without a CAT in some states which only scan the ECU of the vehicle. So long as readiness is set in the PCM and all sensors check out to their system you pass, has nothing to do with a visual inspection.
Counties around the major cities have emissions testing, smaller ones (population wise) dont.
Its the typical OBDII scan and a visual inspection of the exhaust. A lot of places do skimp on the visual though. I only checked for cats when I had reason to suspect they were removed.
As far as noise levels, generally no LEOs care about it. Ive gone from a catless SRT-4 will a full turboback (which stock are loud) to a cammed LS2 with a Magnaflow exhaust (which even for being the quietest exhaust for the car, still is fairly loud). I only know of one person who has gotten ticketed for exhaust in Houston, and he was running a 402 with catless dumps.
2005 BZJ GTO
Misfire and an exhaust leak