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It's a dual system with 2.5" stainless pipes. They are not mandrel bent, that would have been way more $. Would either need a shop with real expensive equipment, or have em weld together a system from bent parts.

There are 2 2.5" cats, and a balance pipe. (connects the 2 systems) Both mufflers sit where the rear muffler was. So one pipe runs down the left side, goes into the muffler, and exits on the right. Other pipe does the opposite.

I haven't had it long enough to comment on it's durability, but from what people tell me, it should last the life of the car. I just have to keep an eye on the rubber hangers. The mufflers are not stainless.

It's got a nice sound, not too loud, and it absolutely snarls when you hit the gas! At idle, most people don't notice it, especially if they're sitting in a Lexus, or other isolation pod.

Greg