02-19-2023, 07:42 PM
They used to sell, catalytic converter "test pipes". Remove converter, install test pipe, and test drive. If it ran good, you'd know what the problem was. The person I knew just left the test pipe on it and drove it. Legality? Don't know. For a repair to do that, I think, it's a big fine.
Jon in Keaau/HPP