ATP opened its first warehouse in Chicago, Illinois over 60 years ago, and it has been producing repair and replacement parts for vehicles with automatic transmissions ever since. They offer a complete product line of high-quality aftermarket parts like automatic transmission pan gaskets, valve bodies, repair kits, and more. They also make parts for other automotive systems like air filters, flywheels and flex plates, and speedometer cables. ATP is now headquartered in Elk Grove, IL and runs its operations out of a 92,000 square foot facility.
Passing your regular emissions test requires your catalytic converter to be meeting EPA or CARB standards. Replacement will, however, eventually be necessary if you fail.