I have just put a Librands manifold and cat on my 2010 plus 4 and am very pleased with the results. The rest of the exhaust system is standard.

The exhaust sound is quieter, deeper and throatier. However, my wife can now talk to me when we are travelling at motorway speeds, which is a mixed blessing! There is also a little more power.

I am also in the process of installing installing individual throttle bodies which is proving to be challenging.