unless you have soot in your cats, there is no cleaning them from what I've heard and learned in chemistry, once a catalyst is used up, you can't reverse it
the headers are probably not as crappy as most I have seen for sale, the fact they are including the diameters of the pipes does say something about the seller though. BUT, these are probably still generic knock offs, they won't give that high a gain (if you had a FED spec car), however, yes, they will flow better over the Cali spec exhaust
you probably can't run the stock manifold/pre cat on one side and then a header on the other as the y pip (to me really an F pipe in my opionion in regards to the shape), good thinking though, but it won't work
gutting out a cat (the catalyst, not the animal) won't sound like trash, it will put more rasp into the exhaust note as well as increasing noise, turbulance will only be a problem if you don't smooth out where the honey comb used to be attached
I do applaud your thinking on switching out the exhaust when it comes time for emmissions, just be weary of the police when you are driving
another option that is NOT legal but will allow you to pass smog if they don't use an exhaust probe is to use o2 sensor simulators, they will eliminate a CEL and will trick the ecu into thinking that you have functional catalysts
hope this helps
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