Leroy Engineering Emissions Statement

The EPA Clean Air Act prohibits by law any tampering, modification, or removal of the emission control system in street-legal cars driven on public roadways, punishable by extensive fines.

Under the Clean Air Act Section 203(a), it is illegal:

"(3)(A) for any person to remove or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter prior to its sale and delivery to the ultimate purchaser, or for any person knowingly to remove or render inoperative any such device or element of design after such sale and delivery to the ultimate purchaser; or

"(B) for any person to manufacture or sell, or offer to sell, or install, any part or component intended for use with, or as part of, any motor vehicle or motor vehicle engine, where a principal effect of the part or component is to bypass, defeat, or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter, and where the person knows or should know that such part or component is being offered for sale or installed for such use or put to such use."

At this time, exemptions are made for off-road, race-only vehicles.

Leroy Engineering is not allowed by law to sell products or services that tamper with emission control systems in street-legal cars driven on public roadways.

Leroy Engineering does support our race market with performance products and services that are not legal for use in emission-controlled, street-legal vehicles. These products and services will only be provided for off-road, race-only vehicles.

For certain performance products and services that impact the emissions of the vehicle, Leroy Engineering will require proof that the vehicle to receive the service is only used for off-road, race-only purposes.

Additional information regarding the EPA Clean Air Act regulations can be found at the following links:

Clean Air Act Vehicle and Engine Enforcement Case Resolutions | US EPA

Recognizing the Protection of Motorsports Act (RPM Act) | Specialty Equipment Market Association (SEMA)

Correction: Warning of EPA racecar threat, SEMA urges industry to campaign for RPM Act | Repairer Driven News

Fight for Your Right to Race! EPA Race Car Ban 2020 Update | Hot Rod

EPA "Engine Switching" policy | Grassroots Motorsports Forum

Edelbrock Product Emissions Guide | Edelbrock

Conditions of Use | DIYAutoTune.com

Repair of Exhaust and Emission FAQs | Ohio EPA