I'm referring to the pre-catalytic converter; my 'tour has two of these, in addition to the main cat converter. Apparently these are there to lower emissions when the car is cold (a cat converter has to get warm before it works, and the precats are both much smaller and closer to the engine so they warm up much faster). I've heard it's not street legal to remove them even if you still meet emissions tests, but I have no idea if it's true (could be, since you normally run an emissions test after the car has warmed up, and at that point the main cat would be working, so just passing the test wouldn't mean you weren't spewing emissions when cold).
Can you tell me more about super-flow converters (either main or precat)?
Originally posted by Marshall Law:
Are you talking about the cat converter? If so it's cheaper to purchase super-flow ones.
