Originally Posted by
PŘ57
lol, catalytic converters aren't meant to be better for the environment in the sense that they gave you more MPG, they help by heating up the exhaust gas even further to help burn the extra carbon crap down to even less harmful gas.
In my personal opinion, it doesn't really even help though and is fairly useless.
i think they only help if your motor isn't running right to begin with.
If you can maintain pretty close to that perfect air to fuel ratio, then you shouldn't have too much extra crap in the exhaust to worry about