LOL....ill clear this one up. It is only illegal not to have a cat if your emmisions are above the legally specified limits for idle, and fast idle. It is illegal for your exhaust emissions to pass out of the vehicle if there is no silencer on, or if your exhaust emits the following: smoke or vapour, ashes or cinders,grit , sparks, or oily substances.
1.8.95- passenger car first used on or after must comply to relevant limits, and also between 1.8.92-1.8.95 must comply to relevent limits (emisison limits)
a police officer can issue you with a rectification notice, because more often than not a decat will fail your cars emission test.
[Edited by gunnergibson on 07 December 2004 at 1:24am]