i've posted this elsewhere, but i'll ask here too since the loudness of the flowmasters has been brought up... i'm going next week to get an estimate for a true dual setup + h-pipe, 2.5" tips, and i'm thinking about the flowmaster 50's instead of 40's. has anyone heard these or knows the real difference between the 2? i don't want a roaring car—i want the dual setup mainly for aesthetics, but i'd like a nice tone as well, and from what i read on the flowmaster site the 50's have the same tone, just not quite as loud. also, how much of a pain in the ass is it going to be if i decided to put on headers later, rather than just get them now? i've having meineke quote me a price... anyone have any idea of what would be too high or what the difference in price between the 40s and 50s are gonna run?