What is the difference between the Bassani SS and the BX system? Is it just the material it's made of? Do they sound the same? Basically, i'm on a budget and REALLY want a catback, but don't know if the extra $300 is worth it for stainless steel, I live in cali and the car doesn't see snow very much if at all, but I do drive in the rain a lot. Would that affect the BX system at all? Thanks.