I ordered a Vetterman exhaust based on great recommendations. I have had it for a couple of months, but only opened the box today. It looked like a jigsaw puzzle. But a look at the directions and it became clear what needed to be done. Except you can't tighten down the top pieces that mount to the cylinder because you then can't fit the next part. Ask me how I know. So there was a bit of putting one, taking off, loosening etc. I am very impressed by the exhaust. I measured from two points to two to have the dual pipes to have the same angle.