You'll need a full exhaust because of the way the original is made. It's no harder to install than a slip on.
Also recommended - and not too loud for me with the bung still in. Just makes the bike sound like it should IMHOI have installed a Mivv Ghibli which I can recommend. It´s of good quality, not overly expensive, looks good and sounds great. A little bit too loud in my opinion, but that is subjective.