okay so i have a few exhaust questions. what is the difference between 2.25 and 2.5? if i have a fc cai and a fc tb whould i want 2.25 or 2.5? through trubendz you only get a borla muffler, what exactly does this mean? what is the difference between this and a complete borla exhaust? also what about bosal? i've never heard of them before, are they any good? is it as good as the trubendz with the borla? i also found a magnaflow for a good deal, and i've heard that they are pretty good. so currently i am looking at either the magnaflow or the trubendz with borla muffler, the trubendz is about 50 more is it worth it to buy that over the magnaflow? also i can get a used mbrp for cheaper than the magnaflow, is that a good choice? thanks.