Originally Posted by sherwood
funny thing is dont turbo setups usually have lower emissions than their n/a counterparts?
i think it has something to do with the heating of the cat to the point where it filters out the crap better?
Yes, they do. If you read the EO article from CARB on the Greddy kit for the GSR, it clearly shows that a new Greddy equipped GSR puts out less "smog" than a new GSR in every possible area of the test.
I don't know if it really has anything to do with heating the cat up better, but rather something the turbo does to the efficiency of fuel combustion to make it cleaner all the way around.