
Local shop in Houston does aluminum exhausts, mostly for competetion vehicles, it sounds really different than other metals though, resonance sounds different in person than on a video. Best thing to do is actually see about getting Oval bent exhaust for ground clearance since alumninum is not nearly as durrable and if it rubs a lot it'll develope holes easily. Just as Ashton said, best to have it at least start where the front crossmember is or about where the CAT starts normally on the car.