does the magnaflow high flow cat flow better than the cat in the shoshop y-pipe?? i have heard bad things about the shoshop y-pipe but i was in a pinch and had to get it at the time as i didnt know of many CSVT parts providers then. does the magnaflow actually pass smog? i will be bringing the car back to cali in a few years and cali is a b*t&h when it comes to smogtests!