I'm not sure if this helps at all:
Motor vehicle emission inspections — Fees — Certificate of compliance — State and local agency vehicles. (Expires January 1, 2020.)
(a) Adopt procedures for conducting emission inspections of motor vehicles. The inspections may include idle and high revolution per minute emission tests. The emission test for diesel vehicles shall consist solely of a smoke opacity test.
Diesel Opacity Test and “k” value
The Diesel Opacity Test is an excellent tool to ensure a diesel engine is properly maintained. This test is used to improve fuel economy, reduce air pollution and protect our health.
The Diesel Opacity Test indicates how much pollution is coming from the engine and whether the engine is running efficiently, by measuring the emission of black smoke coming from the vehicle’s exhaust. This smoke is partially burned fuel which has not been converted into energy.
An opacity meter is used to measure the amount of light blocked in smoke emitted by diesel engines. The opacity of smoke is indicated in units called the k value.
Passing the Diesel Opacity test will assure the vehicle owner that their diesel engined vehicle is not wasting fuel and not emitting particulate matter that pollutes our air and threatens ourt health.
There is a lot of stuff to read my head started to hurt
, couldn't find anything about alterations involving removing of cat though. Here's the site.
Chapter 70.120A RCW: Motor vehicle emission standards
No cat for me, no prob's either.