Would buying, say the maganflow cat that will fit our cars the best give out less emissions and also keep the performance the same (or better) or is it generally if the less you pollute, the more power you lose?
it would give out about the same emissions, and performance would be the same or better.
and yes..generally, the more you pollute the more power you have. that's just the nature of the beast. it's not saying that pollution = more power, it's that way because we try NOT to pollute. so to NOT pollute more, we put things (such as our catalytic converter) in our exhausts path that restrict the exhausts flow..which decreases power.
supposedly in the future, we will run off of hydrogen (at least thats what they are trying to do) so there will be no harmful emissions which therefore means we won't have a cat at all.