In the US and Canada, Federal law expressly forbid the removal or disabling of devices related to emissions control. In the US the applicable legislation is the Clean Air Act. AFAIK, there is no 50,000 mile limitation on this. If I drive a 1975 Monte Carlo, it has to still have the catalytic (or a functional replacement) in place if it is to pass an emissions inspection.METHooD said:Ok thanks for all the information. but do you guys know why it would be illegal to replace or take off your converter before 50,000 mile, but after 50,000, it's ok?
No, not if the converter in your car is functioning properly now and isn't clogged or otherwise damaged. Replacing such a converter with a test pipe or high-flow unit will result in nominal (read "little") power gains.Sorry, but i have another quick question also, do converters help the performance at all, Say if i was going to upgrade, is it even nessary?