If you run unleaded gas aluminized steel will last many years longer than most will keep their rides.
A 3" system will loose some bottom end torque feeling but will give you better 1/4 mile results. It's been proven by those who use to think a 3" system was slower.
To say there are no real gains in an exhaust system is wrong. 1/4 mile ET's prove different. there are no big gains in an aftermarket exhaust system. Although MBRP claims some rather impressive numbers, which in my opinion most aftermarket systems would be close.
So my husband and I and even some of his friends have weighed in. I need more input. I got the little SXT because it is great for my daily driving - over 25 miles one way to work. But I would like to give it more of a deep growl. My hubs says to do a cam upgrade and some of his friends say just...