I am switching out the cat-back on my 94 cobra and am deciding between 2 systems....the american thunder cat-back and the mac flowpath cat-back. I am looking for the louder, more aggresive sounding of the 2. I did some searching around and saw that the new american thunder systems come with the newer delta-flow mufflers which is what has me worried. I loved the sound of the original 40 series mufflers and have been reading that the delta flows are a bit quieter which is what had me looking into macs system. What do you guys recommend? The remainder of my exhaust consists of bbk longtubes with an off-road h-pipe if that matters.