Most shops do crimp bends(reduces pipe diameter where the bend is made). While this isn't like mandrel(same diameter even in the bend), some people say it's okay since our cars don't make that much power anyways. I got the stromung because it was mandrel, so I don't know how a crimp bent exhaust feels. I've heard you still feel power gains, so it doesn't sound bad, especially for the price. As for what to get, get stainless steel piping if possible, and a resonator to prevent buzziness in the exhaust tone.