California Downpipe Laws: A Guide to Installation and Compliance

California has some of the strictest downpipe laws in the country. California residents must ensure their downpipes are installed and maintained in compliance with state regulations.

Downpipes in California must be sized correctly to prevent water damage and erosion. A 3-inch downpipe is typically required for residential homes.

The California Plumbing Code (CPC) outlines specific requirements for downpipe installation. According to the CPC, downpipes must be installed with a minimum slope of 1/4 inch per foot.

Proper downpipe installation is crucial to prevent water accumulation and potential damage to homes and properties.

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Installing an aftermarket exhaust system on your vehicle in California is perfectly legal, as long as it doesn't exceed a sound level of 95-decibels when tested under SAE J1492.

For context, a power lawnmower and jackhammer each produce approximately 100-decibels of noise, according to Purdue University.

You don't have to worry about installing an aftermarket exhaust system on your vehicle, it's still legal in California.

In fact, as long as it doesn't exceed a sound level of 95-decibels when tested under SAE J1492, you're good to go.

For comparison, a power lawnmower and a jackhammer each produce approximately 100-decibels of noise, so 95-decibels is actually a pretty reasonable limit.

Just make sure to comply with all other exhaust and safety laws and regulations, and you'll be fine.

Dr. Jekill & Mr. Hyde exhaust systems have a dual personality, and it's not just a play on words. They're designed to enhance motorcycle performance while also being environmentally responsible.

The California Air Resources Board (C.A.R.B.) plays a crucial role in ensuring that these systems meet strict emissions standards. Established in 1967, C.A.R.B. oversees air pollution and vehicle emissions control within the state.

Dr. Jekill & Mr. Hyde exhaust systems are subject to C.A.R.B.'s regulations, which prohibit the installation, sale, or advertisement of any device that modifies or alters a motor vehicle's pollution control system. This is to preserve air quality and safeguard public health.

Consider reading: Downpipe Exhaust System

A significant majority of Dr. Jekill & Mr. Hyde exhaust systems produced from 2017 onwards have obtained C.A.R.B. approval, signifying compliance with emissions standards. However, some systems may still be undergoing the approval process.

By adhering to C.A.R.B. guidelines, Dr. Jekill & Mr. Hyde actively contributes to California's efforts to combat air pollution and mitigate the adverse effects of vehicle emissions on the environment and public health.

Vehicle noise regulations in California are governed by the California Vehicle Code, specifically Division 12, Chapter 5, Article 2. The code requires every motor vehicle to be equipped with an adequate muffler in constant operation and properly maintained to prevent excessive noise.

Excessive noise is primarily a nuisance issue rather than a safety concern, and determination of excessive noise is subjective. Enforcement personnel are to exercise sound professional judgment in making a determination of violation.

The noise limit for cars in California is 95 decibels, exclusive of motorcycles. This limit is measured at a distance of 50 feet from the centerline of travel.

Here are the key California exhaust rules:

Note: The Society of Automotive Engineers (SAE) test procedure J1169 is used to measure exhaust noise levels, but the exact testing methodology is not publicly available.

Vehicle inspection and enforcement in California can be a bit tricky, especially when it comes to modified exhausts. The state cares about two things: how loud your exhaust is and how much it pollutes.

The California Highway Patrol uses sound professional judgment to determine excessive noise, which is subjective. Enforcement personnel are trained to make a determination of violation.

Rules governing modified exhausts can be found in Division 12 of the California Vehicle Code. You need some kind of muffler, as stated in sections 27150-27159.

The noise limit in California is 95 dB at a distance of 50 feet from the centerline of travel. This is outlined in subheading (b) of Article 2, section 27151.

To ensure your aftermarket exhaust is California legal, look for an Executive Order (EO) number. This is a stamp of approval from the California Air Resources Board (CARB).

The EO number is your ticket to passing your biannual smog check and avoiding a ticket from a cop if you get pulled over.